Somewhere on the Rotorheads forum is a thread about a pilot who was prosecuted for landing on a sports field. The circumstances were different from the intention here, but it shows that there might be someone watching who would be more than willing to dump you in it with the CAA.
If he has the landowner's permisson and is not contravening any ATC restrictions and is flying within the bounds of the ANO, how could he be 'dumped in it with the CAA'?
I don't think we know the TORA or if there are any obstructions on the climbout. If these are favourable, a 152 should not be a problem.
SSD