Thanks for the replies. They took the existing pads off cleaned them (and the discs), greased the brakes and put the pads back on. I'll see how long it takes for the squeals to return. Nice to know I have the option of replacement if I want.
I don't take the car on track but I did have to brake hard a few weeks back when someone signalled left and then carried straight on in front of me. Boy, was I impressed with the deceleration and somewhat grateful for it too.
I didn't know you can jetwash the brakes themselves. My very first car, nearly 50 years ago was a Hillman Imp and I've always done what the old man told me... "Never point a hose anywhere near the brakes, son". A habit I'm sure I could break.... of course I could. Of course. Yup.