Berkshire is a very good county for getting your motorhome holiday started, not too far from the coast and easy access to the South West via the M4. You should also bear in mind that there is a motorhome hire depot at Heathrow Airport too. In the private motorhome hire network there is a good selection of Berkshire motorhomes for rent.
If you are planning on going to Reading Festival in August you might want to pick up a motorhome in Reading and enjoy the festival in total comfort.
There are quite a few events in Berkshire you might want to hire a motorhome for, how about Bracknell Jazz Festival? or maybe these that you may or may not have heard of: Heavenly Planet, Henley Festival, Marvellous Festivals, Reading Festival Bridge, Reading Fringe Festival and Windsor Free Festival. Having a motorhome as a base for a festival is just the best, no messing about in tents and no worries about having to drive anywhere after the festivities, just wait until the morning and set off in your own time.