Moving aircraft by road is pretty easy. However before anything happens you need the AAIB and your insurance company to OK it being moved. This will generally mean that you will have to get at least one licensed engineer plus help to the site.
You will also need lifting equipment and a suitable truck. Dismantling an aircraft to move it is quite quick, a couple of hours would do it. Supporting it so there is no further damage might take another couple of hours and a lot of timber/steel/mattresses.
Of course none of this can happen if the AAIB or police are involved in an investigation - or even better if you worthy farmer refuses access - which he can do!
Couple of years ago a Cessna spent 4 months in a field as access was refused until the field was cropped.
In the States it is common to buy 'hirers' insurance, to cover the losses that this sort of incident can lead to. Here the insurance companies will pay reasonable costs for recovery. But if a club is involved and the aircraft cannot be recovered promptly then a club is entitled to take action against the pilot. Moral of the story? Be very nice to the owner of the ground you have arrived on!