You've picked a good weekend Dicky as it's the first time the Imber range/village has been open this year.It's normally open for a week at easter and two weeks during the summer close down in August,but for some reason they did not open it up.
The four ways on to the range are-
Warminster-
http://www.streetmap.co.uk/map.srf?X...6729&A=Y&Z=120
East to Gore Cross (this bit is all tarmac)-
http://www.streetmap.co.uk/map.srf?X...0929&A=Y&Z=120
and Bratton to the North-
http://www.streetmap.co.uk/map.srf?X...0839&A=Y&Z=120
via Imber village to -
http://www.streetmap.co.uk/map.srf?X...8479&A=Y&Z=120
http://www.streetmap.co.uk/map.srf?X...8479&A=Y&Z=120
Heytesbury in the South.

The Bratton-Heytesbury bit is trail bike/4x4 only.

There is a nice pub and garage with a jet wash/hot food in Tilshead and some great lanes to try...the one's up to and around the mock German village are great but hard going if very wet.
http://www.streetmap.co.uk/map.srf?X...7249&A=Y&Z=120
http://www.streetmap.co.uk/map.srf?X...7249&A=Y&Z=120
http://www.streetmap.co.uk/map.srf?X...5459&A=Y&Z=120
http://www.streetmap.co.uk/map.srf?X...5479&A=Y&Z=120
This one is o.k on road tyres even if wet-
http://www.streetmap.co.uk/map.srf?X...2759&A=Y&Z=120
and this is a great lane if dry but a lot of tree roots etc so not so good if wet on the bigger bikes-
http://www.streetmap.co.uk/map.srf?X...2634&A=Y&Z=120
again...this will be good if dryish-
http://www.streetmap.co.uk/map.srf?X...9644&A=Y&Z=120
and all can be linked with the Imber route.

I can't make that weekend as I'll be on a Somerset Cricket coaching course at Taunton.......but I know where I'd rather be!!!

Cheers,
Andy.