MOT wise - during may 2018 the manual ( testing bible) was re-written. Before that date it mentioned bump stops as a non-testable item. Now they are not mentioned at all, but a suspension component missing is a fail. So it could be argued that a missing bump ( where fitted as standard - note NOT a Morgan trad) should fail - after all its a suspension component. If there is evidence that the suspension has been bottoming out ( eg tyre witness marks on body) its not a fail unless contact is seen during the test.
Rubber bump stops seem to hold up well - sometimes they corroded at the base and can fall off. Worse for durability are the dense foam ones - I see these in various states of degradation on vans, likely where heavy loading has likely over-worked them. I have never come across a leaf spring that's inverted but seen many broken ones. Its amazing how much deflection/movement a leaf spring has when in use. Any suspension unit - leaf, coil, strut, shock etc has to be doing its job - if the body is sitting on its bump stops then it obviously isn't working and would fail.
Motorhomes however sometimes have aftermarket "spring assistors" - these look a bit like bump stops ( sometimes air filled) and are sandwiched between spring and body in constant contact - these are Ok.
Gets a bit complex this MOT stuff - if in doubt "what does it actually say in the manual" is the golden rule.
Rog , great news that you have another batch of the Morgan bump stops in production - very excited about fitting/trying them in my car.
