Hahaha! I don't think that nettles suggestion will appeal somehow! He hates stinging nettles; they were the first weeds he identified when doing gardening for the first time. (He learned the hard way)

I'll pass on your ideas Dave, as we're desperate for anything that might help.

He's on the last day of Ramadan, and wasn't too keen on taking the Piriton tablet (absolutely nothing should pass one's lips during the daylight hours) but it ends this evening at around 9pm (start of Eid el Fitr) and I persuaded him neither God nor Mohammed would mind!