We all know how expensive door latches are and how much grief they can cause, but it seems that if you have a GEMS with a dodgy drivers door latch, there's another option (as Marty is still away and not able to supply refurbed ones). Some may be aware that the MG TF uses the same latches as the GEMS P38, the only difference being that they have 6 + 2 way plugs rather than the 6 + 1 on the P38. Not a problem though as you only need to use the black wire in the 2 way connector and ignore the extra grey one that the MG latch has. However, while Rimmers have huge stocks of latches for LHD cars at ridiculously cheap prices (probably because there's not that many LHD MGs in the UK), latches for RHD MGs are around the same price as latches for RHD P38s. Every supplier seems to want £200 or thereabouts plus the VAT. All except one it seems, how about this https://www.ukmgparts.com/product/mgf-mgf14-exterior-bodyshell-panels/door-lock-rh-mgf-tf-rhd-fqj102262pma. There are two part numbers for the MG latch, the other one is FJQ000080PMA which you don't want as it is for the basic MG without central locking so doesn't have the microswitches we need.
If you have a Thor the plug is different. It uses a single 8 way plug but the latches are the same as on the GEMS so if you need one and don't mind getting involved in a bit of soldering and swapping the plug over, the MG one will work in a Thor too.