I have to pretty much agree with that, though obviously a lot depends on which type of photography you want to get into.

Don't forget lighting, if you want to do portraiture. Budget another grand for that. I'd even budget a good £500.00 just for bags to carry the stuff around in.

Then don't forget a good £600.00 for insurance, which includes your liabilty and other legal bits that you'd need.

I doubt you could even start in any serious capacity for much less than £10k

Maybe not the answers you wanted. But its the realistic answer.