Should go down in one hit.

Sure they weren't Looky-Likeys ???

For future ref, tell-tale signs are:

A accent only understood by fellow caravan dwellers
Large discount for cash offered ( still unsure of 1st price quoted )
A request for £200 up front
Cross bred dog sat perched on centre Transit seat
A work crew including a ruddy nosed 15 stone man called Pat
Tools= 2 shovels, barrow & a tamping plate (which never leaves van)
Neighbours reporting garden furniture etc disapearing
Tarmac arriving in tipper identical to those of nearest road works
A offer to rectify vital house repairs you didn't know you needed
Lastly a helter-skelter shaped drive after 2 weeks use
3mths later cracks resembling the London Undergound map