No problem Bluebell. There’s little I can give advice on – I’m always tapping Charles deep mine of knowledge! – so it’s nice to give back a little when I can.
I screwed mine to a series of 2×2′ flag stones that I bought from B&Q, laid on a dry mix of 6 parts sand, one part cement. This allows some flexibility in the mortar mix which helps to prevent flags from ‘rocking’. These were laid on a hard core base that I compacted. Probably overkill, but that’s what I did. I have no experience of your possible method so wouldn’t like to pass judgement.
I also gave some thought to storm damage as our site is pretty open. I replaced some of the aluminium braces with steel – these are very strong and prevent the whole house flexing in high winds – this can apparently ‘pop’ panes out. Can’t hurt anyway. Mastiking the clips (using only a small amount on each clip I hasten to add!) can help prevent them popping out too.
Quite enough from me, I hope you have much success with your veg growing.