Sorry to hear of your “clonk”, Roger - I must say I don’t have either or rattle — now. I did have a distinct rattle when I got the car and on investigating, my dealer found a small ratchet spanner lodged in the space under the spare wheel!! End of rattle!
My wife remarked that she was not sure it was a Morgan as it didn’t rattle like the three previous ones!!
Hope you get it sorted soon!