Adapter from Apple runs $100 in the US, and as the case with everything in UK, it'll cost you more than the price after currency conversion, probably between 50 and 100 pounds.
Note there 2 adapters:
ADC -> DVI (inexpensive, small piece similar to DVI to VGA, but NOT what you need for the display)
DVI -> ADC (comes with a power unit, this is what you want)