Thank you both for your replies. I took a look earlier and tightened both front ones up a bit. They still were smooth without noticeable sound so hopefully the bearings themselves are ok. MOT is due in 1 month so I guess I'll find out then for sure.
Bit annoying having to steak/punch the nut. The only bearings I've done myself were on Mercedes which have a nicely designed lock nut, I wonder if anything like that is available for these cars.