Edited by elekie&a/c doctor on 15/08/2022 at 15:58

As your pads are almost new, get the discs done too, before the pads get fully bedded-in on the old discs. They will then happily bed in on new discs, which is what should happen, normally. These days, discs and pads commonly need replacing together - pads are harder than they used to be.

the pads have only a fortnight of wear on them.

Who gave you that information? If true, then I reckon it wouldn't have been an advisory, but a fail. I suggest you get a second opinion as you say you don't do much mileage.

MOT showed both discs and pads on the front as advisories.

As a rough guide, on a carefully driven car, front pads should last around 40- 50,000 miles and the discs, with occasional attention to rust and ridging, around 80 - 100,000 miles. On some well made cars the original parts will last even longer.

.... the pads have only a fortnight of wear on them.

Nonsense. Distance, not time, wears pads. As a rough guide you should get around 5,000 miles per mm of pad thickness. Have a look and see how thick they still are. They only fail the MoT if worn down to less than 1.5mm, at which point they are still perfectly serviceable. Garages like to fail them too soon, even when they are still just as thick as the backplate (about 4mm) ...'won't last till the next service, squire...' because it's easy work at £80 per hour - and they can also make a turn on fully priced replacement parts which might not be nearly as good as the original parts.