Need merchant provider

Hi Roomies.

Sounds strange I know but the design side of things is more or less complete.... now i need to setup the bit where the customer can actually make the purchase. Ideally we need a merchant provider which simply takes a commission, with no up front payment or monthly charges. We're based in the UK. Any suggestions appreciated!

Warm regards,

Joel

Ideally we need a merchant provider which simply takes a commission, with no up front payment or monthly charges

This part about no monthly charges or up front cost is going to be a problem,
and will most likely limit you to the likes of paypal or google checkout.....

As per Merlin's advice..
..Suggest you visit
http://www.zen-cart.com/index.php?main_page=infopages&pages_id=39
Contact first company on that list..they are very helpful, free mod for them
in downloads section, which works fine.
Otherwise, you can approach any of main UK Banks for merchant account, and use Protx, which is going to be far more expensive that any of options outlined above, apart from paypal/google, which are only ones that fit your criteria re fees.