Thanks for the feedback Colin -
"a little fiddly and yet quite brutal at the same time" - you summed it up perfectly!
I managed to get the whole job done in about 2.5 hours (both wheels) with a pair of long nose pliers, both for releasing and refitting the retaining springs and then fitting the larger holding spring, with the addition at this stage of plenty of brute pulling force on the holding spring, grunting, sweat and appalling swearing ! I also cleaned and then lightly greased the threads and tube of the adjuster as well.
Here's what I found: One of the retaining springs was broken, the RH pads as I mentioned earlier had separated from their backing, someone had attempted to glue them to the backing metal.
I also noticed what looks like heat discolouration on the RH wheel hub, probably heating up from the car being driven with the handbrake engaged- this must have been James' wife....
For anyone attempting to do this job, this tool looks like it could save a great deal of grief-
http://www.amazon.fr/Hazet-797-Pince-ressort-frein/dp/B001CA110A/ref=sr_1_1?ie=UTF8&qid=1438420612&sr=8-1&keywords=hazet+797I wish I had it, it would have saved sore hands and muscles and a great deal of time- I've just ordered one, in case I ever need to do this job ever again......
Thanks and best,
Mike