Hi BlackIII!
Asking tech questions in the intro forum?? This will go on your permanent record. I'll have to put you on level two probation
That old Flipper is a pretty fart smeller. Squealing is caused by the pads vibrating so to kill the squeal you need to stop the vibration. As Flip said, one way to do this is to apply some sort of anti squeal stuff to the back of the pads. Depending on what you buy, this could end up being something sticky or it could possibly be some sort of high temp grease. You should be able to hit your local auto parts store in England and talk to the parts guy and he should have something.
There is also something that you can apply directly to the pad surface. It's simply called "anti squeal" and its made by B&G, but I have no clue if B&G sells in England. Here in the states B&G only sells to shops. There may be others who make something similar so you might ask.
You can also grease the carriers, ie the brackets that the pads ride in. CAREFULLY apply a little high temp grease to these and then re install the pads without getting any of the grease on the pad surfaces.(You want to grease the grooves that the pads actually sit in so that if the pads vibrate the carriers don't experience any friction and add to the problem).
Another trick is to make your own brake pad backing dampener by gluing some sort of material directly to the back of the pads. Something like your Harley Davidson mouse pad would work just fine, the material just needs to be something that will soak up vibration and not fall apart because of the heat or moisture.