Simon, dear oh dear I just wanted you too know that your budget is too low!! Im entitled to mention that. £4 is slave labour frankly. As another poster has mentioned here its too low.
Cutting corners with designers will almost certainly result in sub-standard design and operation of the site which usually means more expense in the near future to correct errors made the first time round. So a false economy. Good luck with it all anyway.
Would you consider increasing your hourly rate or setting an overall budget for the project?
£4-10 is very low for a self employed / freelance web developer as whilst the initial figure may seem fair the developer must pay comission to PeoplePerHour, income tax, national insurance contributions, pension contributions, indemnity insurance and so on (mostly things that are usually handled by an employer before an hourly rate is established).
Taking this into account this puts the best case hourly rate offered well below the UK minimum wage after deductions for what is a skilled profession.
Please don't take this as a slight against your business or yourself; I'm just trying to help you realise the market value for the majority of freelancers on this site who will deliver and exceed the kind of quality you'd expect.
All the best.
Dear oh dear Simon - budget is way too low. So not for us. Sorry.