Ive haf pagid discs and pada up front for last few months with bo issues but recently they are making a dull groaning noise when slowing on the motorway, feels a but rough through the brake pedal

They cant be warped yet can they?

Hmm doesn't sound good. Mine has mostly Pagid brake parts (all apart from front pads) and they've been on for over 3 years and 48k miles. Did have a bit of wobble a while back which was cured by an Italian tune up. No untoward noises other than the common "mooing" in reverse sometimes.

 

Have you checked you don't have a sticking caliper and have you done a visual check on the discs/pads (ideally with the wheel off)?

 

If you don't have a friendly local garage I'm in Stevenage today and all next week so might be able to help with diagnosis.