Hi, sorry I've been away so might have missed something. However, did you try this trick I posted below a few weeks ago?
Don't talk to me about ruddy clutches...
First of all make sure the hydaulics are working. You'll need somebody looking underneath whilst you push the pedal. If the pushrod from the slave cylinder is moving the clutch operating lever back and forth then it's not that.
Stuck clutches are far more fun. Warm up the engine. Stop it. Put it in first and restart the engine so that your Commer starts to move. With your left foot, depress clutch pedal (it's vital the hydraulics are working, as above) and then with right foot stamp on the other two pedals alternately, going on and off the throttle and brakes. The shunting will either free it all up with a bang, or you run out of road. It's normally just a bit of corrosion on the flywheel sticking stuff together. This method does work, my Commer sits in a field all winter and it happens every year.
Radial or Xply? Radials every time for me, and apart from being a bit quieter and riding better, they are far easier to replace in an emergency if you suddenly find you need a new tyre in the middle of Doncaster bypass on a wet tuesday night. Few tyre places carry xplys in stock these days. Oh, and never mix radials and Xplys, you will skid and crash!
I use a "value" tyre brand called Fate, they were about £40 each fitted and balanced. When I first had them I wondered if they were a fate worse than death, or indeed a Fate worse than a fate worse than death. But they've proved to be excellent. Don't buy the absolutely cheapest Russian or Chinese brands, I've had them de-laminate and generally disintegrate on the move. It's not funny I can tell you.