That's kind of a big claim based on your problems with "the process for receiving payments on a website". Although I don't disagree that the UK startup scene is fragmented and less of a force than it should be, I don't think the fault lies with not being able to accept a payment on your website.

Although I'll take your title as british humor and say the word "doomed" in a dark echoey room.

There are people working to build a startup culture over here (i.e. http://www.startupbritain.org/) and I think the solution lies a little bit before your step 1. So here are my 7 steps to prepend to your 7 steps:

    1. If you've successfully gone through building a startup, reach out to other startups in the UK and offer advice. Don't wait for Seedcamp to ask you to mentor, make yourself known and help out. Hell, no one's tweeting with #UKStUp so introduce yourself
    2. If you're trying to launch a startup in the UK, tell other startups that's what you're doing, so they can follow, and you them. Hell, no one's tweeting with #UKStUp so introduce yourself
    3. Be vocal about your failures.
    4. Be vocal about your successes.
    5. Organise or attend meetups in your area.
    6. Meet up with UK people at conf abroad.
    6.5. ...and probably some other stuff...
    7. Profit!