Saw this deal in my local Woolworths (Cardiff - Albany Road) yesterday. Xbox 360 Core, with Viva Pinata or Fuzion Frenzy 2, and a 64Mb memory card, all for just £199.99.
Looking on the internet, the cheapest I've found these products to be are (without vouchers or codes):
Xbox 360 Core : 189.99 - Amazon
Viva Pinata : £24.99 - Argos
Fuzion Frenzy 2 : £24.00 - Virgin Megastore
Memory Card : £17.99 - Play/Gameplay
Effectively getting the core system for £157.01. Good for those who missed out on the Amazon.de deal.