Welcome to the forum Kenford. Insurers are a slippery bunch and you do not find out how slippery until you try to claim something from them.
They particularly enjoy 'insuring' or at least taking your money year after year when they have a good idea that they can quote something you have stated in your proposal that is incorrect.
My advice is answer all of their questions on the proposal with honesty, otherwise you may only end up with the basic legal 3rd party cover. It may not cost much more but they have access to various sources to find out if you told the truth.

Hi Kenford and welcome to the forum :welcome1:

'Motorhome' is a specific registration category, and they are classed as either 'Private Light Goods' or 'Private Heavy Goods'. there are specific requirements which must be met to register a vehicle as a motorhome, the main ones being (I believe) that there must be a bed and a table for eating at (which can be free-standing). Your van which has become a motorhome would need to be inspected by VOSA to check if it complies with the requirements for a motorhome. if it does you will be issued with a new V5.

This is based purely on what I have read elsewhere, not on any personal experience.

Good luck with it. Do ask the questions - I'm sure you can get teh answers on here. :thumbs: :thumbs: