Someone was saying on Saturday's ride that there had been so many preregistrations that there were very few places left for UK riders who qualify this year. That can't be true, surely?
Last count I saw was about 2,600 pre-registrations - which means a bit under 4,000 places still left. That is assuming they stick to 6,500 - but it has been suggested they may have a contingency plan for more if needed.
There are no country quotas, so there's nothing specific about UK or anywhere else - all places are open to all.
From what I have read also, the implication is that pre-reg places have a limit too - if true (which makes sense) then not all places will go before registration opens. My guess is that maybe 50% or a bit more have been allowed for pre-reg.
Also remember, that people can pre-register without having all qualifiers. So even if you do end up wait-listed, places can open up later.
At this stage, I'd say don't stress. Stick to your qualifier plan, and register as soon as the time slot opens. You should be fine.