3rd/4th gear noise?

Well it will probably feel different with the new gears and clutch.
They would have had to disconnect the clutch cable to get the gearbox out but it is possible they haven't adjusted it correctly as most garages these days are used to self adjusting cables.
You can easily check it yourself.
If you go underneath and find out where the cable enters the gearbox. There is an angular plastic cover that you remove by pinching in the sides. You should now see the plastic threaded adjuster.
It should be adjusted untill you have a couple of mm slack on the outer cable a bit like a clutch or brake cable on a bike.
Has the gearbox noise gone?

The missus is just picking it up from the mother in law who said it felt stiff, noise is gone she said.

Well missus is home and said it feels fine.
Just gotta build the enthusiasm to change the passenger halfshaft oil seal for the third time now... Thirty nuts to undo and get covered in diff oil, lovely smell that stuff!-)

I think I've been damaging Them while locating the long halfshaft on that side... New plan is to slide it on the shaft then push the seal in once the shaft is located....

Good luck

Well all done, other than fighting a brake pad that popped out all went smoothly. I couldn't push the oil seal in while on the shaft so was double careful.
Ah also left an extension bar wedged in the hub and bolted the disc on, lucky I had a wipe up round the back and saw it!!! Eeek.
I'm not driving it till tomorrow, mainly so I'm not depressed all night!-) hopefully it's third time lucky.
Thanks everyone.