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During normal running at 40 mph or above I am occasionally experiencing a dull (thud-thud thud) sounding vibration from the rear of the car. When I stop and investigate the rear N/S hub is very hot.
I had the rear discs and pads replaced last year. I was going to do it myself but found that the caliper slider pins were seized, so I obtained a repair kit and entrusted the work to a local garage. They did the work although I noticed that the handbrake felt a little keen.
All seemed well until January when the vibration and hot running started. I initially suspected the hand brake shoes were binding and causing the problem, but having changed them the problem persists. I now suspect the caliper because I am not confident the caliper repair was carried out.
Has anyone experienced problems like this and if so what was the outcome?

Is there an unusually large amount of brake dust on the rear wheel? This may point to a sticking on caliper.

I know you've already changed them, but I'd be tempted to have another look at the handbrake shoes. It's not unheard of for the friction material to detach from the shoes.

In my experiance with the rear brakes on these (see my post's).
When the sliders are siezed the pads with the piston behind only work,
The caliper cannot slide to allow the outside pad to make contact , But mine were very bad .

It has been know for the calipers to slide & bind onto the disc & not return, this will usually get rapidly worse because of the heat generated.

Jack up the back end & pop on axle stands, try to spin the rear wheels by hand with the hand brake off, if you can't do this you have a problem.

You can take off the rear wheels & look at the rear disc's, if the swept area is a blue colour your calipers are sticking or the centre of the disc may appear pink 'ish' (on the drum/hub part where it's rusty).

If this is the case, carefully use a pry bar on the inside of the caliper where the pads sit & gently pull the caliper towards you a bit at the top & then the bottom,
keep repeating until you can see a tiny gap between the pad surface & the disc.

You should now be able to spin the disc assembly by hand, if you cannot the prob lies with the hand brake assembly. If you can then press the brake peddle a few times & then try to spin the disc assembly again, chances are it's binding again if this is the case then I guess the caliper rebuild wasn't done or was done badly .