We're absolutely looking to attract people who are motivated by the ideas and the opportunity but we do also aim to pay relatively competitive salaries.
Which perspective do you comment from? Are you used to working in a higher paid environment?
I think SandB0x was suggesting that if you want above average employees you may need to offer above average pay, although I'm aware that's not a literal interpretation of the comment.
Personally, I find the ideas behind Opendesk inspiring and I'd love to move to London... but the significant pay cut I'd have to take to work for you is more than I'm willing to pay. Sadly, ideas do not pay for rent or groceries.
People get that out of [good] colleges for a first job, ignoring the students who do get more than that.
It ranges from junior out of college to senior with many years of experience. That only includes people who can FizzBuzz though.
IMO: I'm a firm believer that anyone with a clue who's offered 35k£ for that kind of role should just stand up, thanks the interviewer and leave.
Basically, what @okey said. Your company looks really cool, but financial security is a much stronger motivator for most people in the long term.
Look at what other people are offering in this thread, on Glassdoor, on angel.co and similar. I've never heard of a developer being paid £20k in London and I'd worry about working at a place that hired people at that rate.
You might be able to get someone fresh out of undergrad for £25k for your front-end role, but not a developer with proven skills. You might find a developer wanting to try out your lead role for £55-65k, but not someone who's already shown they can perform that role successfully.
Maybe you will get lucky and find the right people, but it's a gamble and any good people you find will probably not stay long. Anyway, I wish you luck despite my naysaying.