the MOT will let you tax and ride on the road along with insurance.
the MSVA will prove the road worthiness of the vehicle which will allow an MOT, the MOT only covers a small part of the MSVA test, theory has it that it should be all that's needed but I suspect the MSVA is a bit like a house sign off by a council inspector, once signed off the builders can then paint and final fix, the house is then signed off by site foremans walk through.
the MOT will allow production of a V5c after the vehicle has finally been finished,
MSVA will probably remove panels to check welds and joints and couplings, making remarks if changes are needed.
worse thing is finding an MOT station that can do trikes..
