ADE Turf certainly have the top-end gear for cylinder/bedknife grinding.
However, it's likely that they aren't the only firm who do, in the Melbourne metro area, so see if there's someone closer to you. You may have to balance convenience vs. price, though.
There are some 'bitsa' aspects to your SB45. For one, it has the captive cotter main clutch body, which was never OEM fitted to Rover-plated 45's.
