2 convert code block into quoting, by adding some   spaces
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Upon the Demise of the crown (which covers both the death of the current monarch or their abdication, or any other event ending the reign of the monarch), the next in succession immediately becomes the new monarch without any act of government or state required. The throne is never empty.

If this happens during the time Parliament has been dissolved for a general election, then the legislation of the Representation of the People Act 1985 comes in to play, which among other things, was enacted to

amend the law relating to the effect of the demise of the Crown on the summoning and duration of a new Parliament and to repeal section 21(3) of the Representation of the People Act 1918

The relevant passage from the act says:

(3) In relation to the current election, for the purposes of the timetable in rule 1 in Schedule 1 to the principal Act—

(a) a. the polling day shall be—

   (i) the 14th day after the day which would otherwise have been the polling day, or

   (ii) if the 14th day is not a working day, the next working day after the 14th day;

  (bi) the 14th day after the day which would otherwise have been the polling day, or

  (ii) if the 14th day is not a working day, the next working day after the 14th day;

b. any working day within the period of 13 days beginning with the day after the demise—

   (i) shall be disregarded in computing any period of time, and

   (ii) shall not be treated as a day for the purpose of any proceedings before the polling day.

  (i) shall be disregarded in computing any period of time, and

  (ii) shall not be treated as a day for the purpose of any proceedings before the polling day.

So usually the election would be postponed by 14 days. In the specific case of the 2019 general election to be held on the Thursday 12th December, this would move it to the 26th, which in the UK is a bank holiday - a non-working day. So it would, per 3.a.ii move to the next working day, which is Friday 27th December

Upon the Demise of the crown (which covers both the death of the current monarch or their abdication, or any other event ending the reign of the monarch), the next in succession immediately becomes the new monarch without any act of government or state required. The throne is never empty.

If this happens during the time Parliament has been dissolved for a general election, then the legislation of the Representation of the People Act 1985 comes in to play, which among other things, was enacted to

amend the law relating to the effect of the demise of the Crown on the summoning and duration of a new Parliament and to repeal section 21(3) of the Representation of the People Act 1918

The relevant passage from the act says:

(3) In relation to the current election, for the purposes of the timetable in rule 1 in Schedule 1 to the principal Act—

(a) the polling day shall be—

   (i) the 14th day after the day which would otherwise have been the polling day, or

   (ii) if the 14th day is not a working day, the next working day after the 14th day;

(b) any working day within the period of 13 days beginning with the day after the demise—

   (i) shall be disregarded in computing any period of time, and

   (ii) shall not be treated as a day for the purpose of any proceedings before the polling day.

So usually the election would be postponed by 14 days. In the specific case of the 2019 general election to be held on the Thursday 12th December, this would move it to the 26th, which in the UK is a bank holiday - a non-working day. So it would, per 3.a.ii move to the next working day, which is Friday 27th December

Upon the Demise of the crown (which covers both the death of the current monarch or their abdication, or any other event ending the reign of the monarch), the next in succession immediately becomes the new monarch without any act of government or state required. The throne is never empty.

If this happens during the time Parliament has been dissolved for a general election, then the legislation of the Representation of the People Act 1985 comes in to play, which among other things, was enacted to

amend the law relating to the effect of the demise of the Crown on the summoning and duration of a new Parliament and to repeal section 21(3) of the Representation of the People Act 1918

The relevant passage from the act says:

(3) In relation to the current election, for the purposes of the timetable in rule 1 in Schedule 1 to the principal Act—

a. the polling day shall be—

  (i) the 14th day after the day which would otherwise have been the polling day, or

  (ii) if the 14th day is not a working day, the next working day after the 14th day;

b. any working day within the period of 13 days beginning with the day after the demise—

  (i) shall be disregarded in computing any period of time, and

  (ii) shall not be treated as a day for the purpose of any proceedings before the polling day.

So usually the election would be postponed by 14 days. In the specific case of the 2019 general election to be held on the Thursday 12th December, this would move it to the 26th, which in the UK is a bank holiday - a non-working day. So it would, per 3.a.ii move to the next working day, which is Friday 27th December

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Upon the Demise of the crown (which covers both the death of the current monarch or their abdication, or any other event ending the reign of the monarch), the next in succession immediately becomes the new monarch without any act of government or state required. The throne is never empty.

If this happens during the time Parliament has been dissolved for a general election, then the legislation of the Representation of the People Act 1985 comes in to play, which among other things, was enacted to

amend the law relating to the effect of the demise of the Crown on the summoning and duration of a new Parliament and to repeal section 21(3) of the Representation of the People Act 1918

The relevant passage from the act says:

(3) In relation to the current election, for the purposes of the timetable in rule 1 in Schedule 1 to the principal Act—

(a) the polling day shall be—

   (i) the 14th day after the day which would otherwise have been the polling day, or

   (ii) if the 14th day is not a working day, the next working day after the 14th day;

(b) any working day within the period of 13 days beginning with the day after the demise—

   (i) shall be disregarded in computing any period of time, and

   (ii) shall not be treated as a day for the purpose of any proceedings before the polling day.

So usually the election would be postponed by 14 days. In the specific case of the 2019 general election to be held on the Thursday 12th December, this would move it to the 26th, which in the UK is a bank holiday - a non-working day. So it would, per 3.a.ii move to the next working day, which is Friday 27th December