Perfect. Thanks for that. Just what I was after.
Blimey, I didn't know they were that expensive and yes I do have the catcher.
Need to go back and see the guy later in the week so will ask him if he has any bits left over. He is a very well to do retired gentleman for whom I often do favors for at short notice which he obviously appreciates.
Looks like all that's missing is the inner bearing for each wheel, item 3, and the cog, or ratchet as they call it, for the left side axle, couple of bolts and washers to hold the wheels on which I should have by the dozens in the garage.
I'll take your advice and check that it's all running and no other problems with the drive before I start ordering parts. However if it all starts to get too complicated and time consuming she'll end up on ebay because like it's original owner I need the time more than I need the mower.
Can't thank you enough for your help. First time I've ever posted a question on a forumn and actually got some useful advice. Awesome mate.