Hi Dave - Had a look today down the passenger footwell and there are two hatches in the centre consul. Opened the most promising one and found a filler about 50mm further forward than the hatch. There is also a red plastic moulding on the side of the gear box near the access. It might just be possible to access the filler from underneath when the car is on a ramp then fill using a hose and filler funnel. Not the easiest thing but then again it is a Morgan.
As I am a newby to talkmorgan do you think its worth opening a new topic to see if anybody else might have had experience of a S2 gearbox? Thanks for your help. Your Miscellany article is always the first I read, hope you keep writing them.
Thanks.