After much research I decided to purchase a Garmin Nuvi from satnaveasy.co.uk which I found to be the cheapest site online. Needing more information I phoned the company and spoke to a member of staff who was most helpful. The purchase of the satnav along with accessories was easy and delivery was as stated on the website, speedy.
There were no problems updating the maps within the time frame given. I would certainly recommend this company.