Is it possible for a UK citizen seek asylum in Democratic People's Republic of Korea ? They seem to have an embassy in London but I have not managed to find their web-site and any relevant information about the process.
Generally speaking you can always seek asylum, the question is what happens to you afterwards. For what it's worth, North Korea is not a party to the main UN Convention about refugees. So it's not clear whether it recognises the concept at all and it is under no obligation to provide protection to anybody. And even under a generous interpretation of the convention, mounting a credible claim as a British citizen sounds like a challenge anyway.
Furthermore, you cannot usually effectively seek asylum in embassies, that's just not the way it works. What the relevant international law is about are displaced people who present themselves to an international border or cross it irregularly, their rights and what can be done after that. You will find a handful of recorded cases of people finding refuge in an embassy and perhaps a few hundreds or thousands of people being granted some sort of visa to travel to another country on the same basis but those are fringe cases and no country is under any obligation to provide protection to people through their embassy.
In fact, even countries that have a generous attitude towards applications lodged on their territory, participate in UNHCR relocation programmes, etc. do not routinely entertain applications lodged in embassies (and I am talking here about legitimate applications from genuine refugees).
You can read about the last one who tried:
An American guy went there as a tourist, destroyed his passport and asked for asylum. His claim was deemed (rightly) bogus by North Korea and he was sent to jail with a 8 years sentence until US succeeded to negotiate his return.
This seems to be the most likely fate for anyone attempting this, but if you have a valid claim, who knows?
Other countries would definitely be a better choice tho; North Korea is not the only option if you seek refuge from UK.
North Korea is a dictatorship. I don't think any evidence or references are needed to support this well known fact. A dictator can have committees (Soviets) to assist with minor decisions such as asylum seekers or even major policy decisions on immigration. But all such policies and decisions are ultimately made by the dictator. In the case of North Korea, none of their policies are bound or shaped by international treaties or standards.
Indeed, the dictator is not even bound by his own precedent in previous decisions. I believe that any N. Korean embassy would be highly suspicious of any would be asylum seekers and just assume they are espionage agents. Instead of risking his/her career or 'more', the ambassador would tend to just not deal with this risk and reject the asylum application.