From my experience, you are better off taking an unusual car to somewhere that normally does mainstream cars. An unusual car is usually the highlight of their day & if you have to show them how to open the bonnet & release the handbrake you are halfway to a pass before you have started.
I find turning up at the local halfords Mot Centre with a packet of chocolate biscuits almost guarantees a pass as long as it all looks alright underneath & its not billowing black smoke.
That was my experience. Had to explain the handbrake and where the door handle was incase the mechanic tried to open the door by pulling on the sidescreen. Stood for about 10 mins talking to the sales rep about it as he'd never even heard of a Morgan.
