I am posting this again aas my initial post doesn't seem to be in the thread, I have checked several times.

Had brake pads and discs changed = inital rubbing noise and then juddering (mechanic suggested warped disc, it was so changed) = Same problem. Balancing and tracking all checked.

Mechanic wouldn't help so took to a big expensive place said couldn't find a fault (had all the computer for alignment etc on it) Changed pads and discs again and said they greased all relevant things up.

Same problem came back, I have always felt it might be the brake calliper cover, another independant mechanic looked it over and could not find fault and said I might be right re the calliper.

Friends Vauxhall Corsa had same problem after a tyre change, Vauxhall main dealer diagnosed her calliper cover, issue resolved.

Money is a bit tight at present and car is ancient so please could anyone advise would I just need calliper cover, disc and pads for that side or would it be likely that I would need both sides done.

Many Thanks.

Cheapest option is buy a used caliper from a breakers yard to try, next cheapest would be a reconditioned unit, depends on your preference.

I wouldn't bother replacing discs or pads again until you have ruled out the caliper.

Other causes could be wheel bearing, steering component issue ie steering rack or a track rod end, or a worn bush or ball joint.