Thanks for all your comments guys. I was aware of the reason 20m was the figure and it is obviously a little ridiculous in this day and age. I had also thought of the options mentioned thank you. It is not possible to put in any sort of additional slip/road/way as the site is VERY narrow. I might have to persuade the Architect to lose a few parking spaces.
As I suspected: There possibly is space there to acheive it, it is just that the space would be more profitable to be used as parking. Don't get me wrong, the financial aspect is a strong one, but it is a far cry from something being impossible.
It is an easy one to get excited about, especially when it is taken in context with "reversing a horse". But it really all boils down to where you set your limits. 20m is quite specific in the document, and as I said before, it is a
recent document. Is 35m ok? That is almost twice the suggested distance.... Is 50m ok? Is 100m ok?
Would the appliance be reversing out onto a busy main road? If not then my personal limit may be extended slightly. Then again, you make a hammerhead near houses and it will probably get used as parking anyway. Each problem should be looked at on it's own merits.