Thanks all for your helpful comments.
There are four of us, my wife and ten year old boy / girl twins. So we would be using both the roof bed and sofa bed.
We are needing to replace the family car which has inspired us to look at campervans as an alternative to a normal family car. We want something that is easy to park and drive around town, which it sounds like the Cali is.
Having a campervan also open up the option of using it to go camping at weekends / holidays and get to see Europe and the UK. I can’t see us using the van for a two week holiday but may use it to drive to Spain for example, and then stay in a villa for a week and then drive back so we get the best of both worlds.
We would like to be able to have the option to make a cuppa on the side of the road but will mainly do outdoor cooking on campsites. We could also have an electric kettle when hooked up to power. So maybe a small portable kitchen and fridge is an option.
We would also want to have a drive away awning to give us options of space when camping and more sleeping options.
We will try to rent a van for a weekend to see how we get on.