Just changed my bike with Bennetts today, from my 2014 GSA to my new GSA TB. Got 50 days left on my policy, they charged me £38 of which £32 was admin charge and no charge when I put my personal plate on the new bike when paperwork arrives.
Less than 5 minutes on the phone, very efficient, £32 is a bit steep, close to 15% of the policy, but they are a business and have been excellent in my hour of need, will be interesting to see what the renewal comes out at.