It's up right now.
I've noticed that they've been having trouble for the past couple weeks (at least.)
Sometimes it takes a really long time to come up, but eventually it does.
Sometimes it comes up normally.
Sometimes it produces an error page: "Internal Server Error."
I've been able to get in most days lately, but not every day. Sometimes I click on the link, then open another link in a new tab and do something else while BritSim loads - or not, as the case may be that day.