Have a look through the 19" models on offer at this shop, OCuk. [Overclockers UK] they have a good selection to look at with next day delivery.
One of the good reasons for buying via the internet is the distance selling regs. You have 7 days starting the first day after the day of receipt to return and ask for a refund or exchange.
This can be very handy if there is a fault with the monitor but do not mention there is a fault or they will put you onto the manufacturer for a swap out, just return stating you have changed your mind and want a refund or a different make/model.
Only conditions are that you must return the monitor in perfect as new condition, the same applies to all the packing, even the little plastic bags and cable ties so be very careful in unpacking the monitor and open the box with as little damage as possible, use a sharp knife to cut through the seals and tape on the outer box.