Thanks very much for your comments MW and Lislaw. I suppose it would be different if your beds were laid on soil rather than membrane? I really don't want my soil escaping from the beds - it's too precious, and would also wreck the gravel area.
Maggie, no problem with butting in. Lots of things are easy to grow, (spring onions, lettuce, tomatoes, mange-tout, carrots) but make sure you grow stuff you like to eat. I grew parsnips for years but the satisfaction in growing them never made up for the grief I got when I tried to make my children eat them!
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