Nothing worse than to discover your MG is all dark and can’t be opened!
Do not despair. The 12 volt battery can still be got at using the emergency key, as we know, which of course is contained in the remote after pushing the small button on its side to open the handle retaining it.
Inserting this mechanical key into the small hole at the bottom of the cap beside the driver’ s door-handle will NOT release the cap by itself! One must carefully PRY the cap off by pulling the bottom of the inserted key carefully towards you, (The cap is hanging on two small plastic teeth at the top and a lip at the bottom). Insert the key into the door lock and turn 1/8 of a turn counter-clockwise. Now you’re in!
(btw: in England, if a “Trunk” is a “Boot” why isn’t a “Frunk” a “Froot”?)