jkveenstra, why not stay in the Netherlands and train there? This will save you a lot of travel and lodging costs and to be honest, the price difference between the UK and the Netherlands is not that big, and will probably favor the Netherlands. A large percentage of the rental fee of an aircraft is fuel anyway and as the pound goes down, fuel prices in pounds will go up with roughly the same amount. So the difference in exchange rates is to a large extent canceled out by the international price of fuel (oil).
At my club (based at Rotterdam), Cessna 152s go for 137 euros per tacho hour wet and instructors for 31 per block hour. A usual lesson is two block hours which includes one hour flying so it's 199 euros per lesson. Landings are just under 20 euros at home base, cheaper elsewhere.
You can book instructors and airplanes by the two-hour block via the internet and if you speak to a full-time instructor in advance I'm sure they won't object to flying twice a day with you for two weeks straight.
I know there are clubs in Eindhoven too who should offer not too dissimilar rates. Ask around.
Another thought: have you spoken to the usual suspects that offer JAA training in the US (OFT, OBA, Naples, AAA)? They might be able to fit you in in two periods of two weeks, instead of a single three week stretch. Obviously that will require an additional flight of a few hundred euros, but VISA and TSA-wise this should not be a problem.