Mike Hood looks to have operated 'IDL as Southern Joyrides from 1977 - 1987.
If there is a Islander joy-ride option at Lands End, I must have a go. If I do the planned trip out to the Scillies, I guarantee I'll get an Twin Otter both ways!
I did also book an "after show" ride in a New Standard from Old Rhinebeck - unfortunately a strengthening wind put the rides and the airshow out of action mid-afternoon. Haven't been back yet...