NoBozo, good advice ! Wil stay close to home port for a while.
Will have wife on next boat outing, so sure don't need to breakdown.
She's insisting on going on trial run ! I warned her the possible consequences.
I'll be bringing my 1/2" wrench just in case..... If engine produces same symptoms, the brass plug will be pulled in the middle of the Broads !
Wife and I are just about ready to switch to 'Sail' after this !
BD