knock knock bang bang front end

Hello Everybody...

Haven't been on here for such a long time as I've had no problems and my wee Golf has been running a dream.
That is until now.
I'm getting a bad metal on metal knock when I go over a pot hole or drain cover from the front right hand side.
I've recently had all the suspension replaced and the anti roll bar bushes renewed all round the front, wishbones, springs, shocks etc.
I had it done as this noise had appeared but the boys at my garage couldn't find anything wrong with the suspension, except wear and tear, hence the fixes.
I am loathe to let them spend hours looking for a knock that they already can't find and was wondering if it could be an engine mounting rubber that's gone...???
The gearbox was replaced by a dealer at 70,000 miles for a four figure sum (that I didn't pay) so the engine would have come out I imagine.
Any ideas?
Yours with a shrinking wallet :1zhelp: