Picture posting is enabled for all :)
ancellsfarmer has come up with perhaps an even more radical solution to unkept plots than mine - that being dropping completely the idea rights to tenancy of the land replacing it with 1 year land 'lease', with each plot holder having to re-apply when their one year lease has expired. One slight problem with this is that the committee members would also have to re-apply every year so you would probably need an independent 'office' to deal with the paper work.