I had this very problem with some 20" forks (as detailed elsewhere). It wasn't an insurmountable problem.Thanks
They look almost identical to the original zoom suspension forks I took off. The problem is the motor rubs against the forks. I need the fixing to be inline with the inside of forks to take hub motor without rubbing
Frankly, you must love your bike to be using something so old. That's fair enough, and good luck to you.
I have acquired newer, and I'm tempted to say "better" bikes for surprisingly little money. I have one in the garage right now, I think I paid £40 quid for. Looks new, though it isn't. It's a Triban and looks something like this....
Mine came without the rear rack, and is grey. It also has 28" wheels. Cost me £40 or £50.
New disc wheels, also bought from someone on Ebay dumping them, £10. Disc brake system, £20. Eventually, it's going to get a rear hub motor, because if needs be, I can move it to another bike more easily than a mid drive. I've also shelled out on a newer set of air forks .....
(I chose this bike, because I like high chainstays.)
My point is, unless you are looking after your bike because it's loved, there are safer, more easily adapted bikes out there, for not much money. You would be starting off with something that would cost less than the immediate remedial work you have to do with what you have already.
This likely won't be in your home town (Bath) and won't be the right size (16") but it's an example of what is available. Disc mounts front and back (the fork is fitted backwards!) Suspension fork .... And the right head tube for any fork combination you might want.