Any ideas on how I can define the perimeters of my allotment plot?

[bearded bloke]

A line of scrap cars would be my ideal

You mean like the Cadillac Ranch in amerrykey Bill ??

[hamamelis]

I've got foot wide old paving slabs on the main path round mine- they come up a lot on the local freecycle, sometimes with a bit of mortar or other gunk stuck to them, but who cares? It beats having mud everywhere when it's soggy!

[Vince G]

Over the time we've had our lottie, I've been acquiring boards/planks etc and these form our perimeter. Often B&Q, Homebase etc let you have lengths of timber for a few pence if they're warped - worth asking, as I got some very sturdy 8 foot pressure treated decking boards a while back as B&Q had a few left which were no good to them as the line was being discontinued.

[Bill HH]

Have you considered laser beams that when interupted play a recorded message? Gerrof my plot" Of course you neighbours will feel duty bound to hire a cherry picker and lower themselves Tom cruise like onto your prize cabbages.