Guys, thanks for the advice, suggestions etc.
Steve, I've tried the reference number you gave me for flea bay but the site doesn't seem to recognise it.
I find the Morgan wheel nut spanner design far from ideal. It needs a slight crank on the handle to provide more clearance from the wheel rim.
Anyhow I've just jacked the car up off the garage floor for winter and I'll get back to resolving this issue in the spring.
Kind regards
Phil