The thing your require is a Foden recovery wagon. If you phone round your local REME TA bases you might be lucky and they will still have access to them. If they don't its hard work but perfectly easy to recover it using a turfer winch and a couple of ground plates and pins.
From personal experence most folk try and use the easy option of using another motor to pull a bogged in one out and either bog that one in as well or knacker it.
If you do get a TA unit interested in recovering it as an exercise just be careful with the reccy mech's. They are a bit thick usually and also hard as nails. Don't use large words and use swear words as punctuation and you should be fine.