I did mine a few years ago with Rollright School of Transport, Enstone, Oxfordshire, when you could go straight to C+E, they explained everything.
I did 6 days training, took and passed the test on the 7th day
The day started at 8am with Highway Code and videos then straight out on the road. There were usually about 5-6 C+E and C learners at this school at any one time. They had two Mercedes artics with 6 gears and 30 foot long flat bed trailers and a ridgid lorry. All the gearboxes were simple except one which had a splitter to give a high and low ratio in each gear.
You share the lorry with another learner, swapping the driver seat every 60-90 mins, and it's suprising what you learn watching another learning
After passing I got some experence driving a friends lorry 17 tonner hauling tarmac or sand, then I got to know a friendly local haulage firm and went out with their drivers. In time I was let loose on 7.5 tonners, and if they had drivers off the 17 tonner or the artic with all its 16 gears
and worked for them part-time.
I think it is important to get some real practice once you pass, especially fully loaded and with splitter and range change gearboxes. And in an ERF with an Eaton twin splitter
Sadly when I moved away from the area I didn't bother to keep it up.
One last tip. When you see you GP for the medical make sure you let him know you are paying the medical and training off your own back, rather than let him think your employer is paying. He may then only charge a token amount for the medical