I've always ran both, i hate driving round in the van when I'm not working. Ive had numerous cars and my current is a volvoxc90 exec, also in the process of doing my motor bike lessons now so i'm going to get myself a toy and buy a Triumph Daytona 675.
I used to have a multi car policy but i found that in the end it wasn't worth it, I've got 10 years ncb on my car and 5 on the van. This also means that EVERYTHING on the van is now business so i can claim all fuel and all other costs related to it and don't have to work out business miles v personal. i'm the same with my phone and this is definitly the best decision I've made as i can now go out and not have to worry about getting work calls when i don't want them