A further note on this. There’s a web site called Carfusebox.com which has illustrations of fuse/relay orientations in a number of cars, MG’s included. The one shown for the mk1 tf is remarkably similar to that shown by our contributor.
Also if you go on Google images & type MGf fuse box layout amongst much else you will find in blue another delineation.
It can be quicker to nip to sites like these than to rummage through what some, myself included, would consider normal channels.
M