The first line applies to me, I am a sole trader, I use my Hilux for personal and business, when I submit my tax return I only claim for the business miles as an expense, the bulk of the time my truck is used for personal use.
But I can see 2 things happening in the future, HMRC will now smack on a huge RFL increase as they will deem double cabs as 'cars', and polluting ones as well, and soon the market will be flooded with double cabs for sale, and the bottom will fall out of the market, but of course I might be completely wrong!
And I agree, no issues at all paying a fair tax.