Hi Richard, I fitted the holder with a 30A fusible link. The holder is to the left of the Starter relay/solenoid. It provides overall protection for most of the cars electrics (and that cable look that runs under the dash!
I will add photos of the additional fuse box - Morgans (like most cars built back then) were not good at protecting the electrics...
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly '09 Gen2 MINI Cooper ragtop '90 LR 90 SW