Hi I got a grinding and the noise it makes in reverse in 2nd, 3rd, 4th and slightly in 5th if I dip the clutch all noises stop, it's very hard to get in every gear. I know the clutch bearing is shoot and was wondering if that could be or if it was both? Thanks

It sounds like a straight cut gearbox with a bit of grinding in 2nd, 3rd, 4th and slightly in 5th?

is it only grinding at high revs? dunno if mk1 got syncro, but my hgt grinds when switching gears at high revs but all normal at low revs, got bad syncro

Its not totally clear exactly what you mean really. grinding going into gears or a constant grindy/whiny noise once in gears...

I'm guessing you mean the latter. Generally speaking noisy gearbox that disappears when clutch depressed would indicate lay-shaft bearing (i.e,. input shaft bearing). Noises that are only present when clutch depressed usually is the release bearing which is what i think you mean by clutch bearing - a clutch has no bearing itself.