Visiting my dentist this morning he suggested in buying a Toothbrush Head cleaning kit, as the amount of germs etc that live on your brush is quite scary! After a bit of searching around on the usual sites I managed to find it for £9.99 with a RRP of £40.00.
This fits Braun and Philips electric brush heads
Not sure if they they are worth £40, but for a tenner i'll give it a shot!
Hope this is of use to someone.