I put the california as a pool car. My accountant was not happy at all and cited a case in England where the owner used it as a mobile office, but taxman disagreed and left the chap with a huge bik bill, despite having a semi plausible justification. He was a building surveyor and did travel through business. I'll try and find it, should b e able to find it with Google.? Went to court to argue case, but lost.
I think the hmrc are wise to it, the case above was enough to put most off.
Meanwhile, I have a vw welfare vehicle as we need washing and cleaning facilities when we're on site. So, it was a £25k transit that needed modified , or a vw that was prepared in the factory. I choose the latter.