Thanks for all your prompt responses.
My phone company hadn't made a mess of things. They did transfer things over as agreed on a "like-for-like" basis. However what we didn't know was that because I had set the transfer manually I had to re-set it when I went to a new provider.
So I got my Stockport number done when you kindly gave me the prompt reply I asked for. The next day I went over to my remote office in Altrincham to re-set the divert there.
Plugged my phone into the tap box and there was no dialling tone. This really confused me. I certainly wasn't a happy bunny thinking the phone company had messed up in the transfer.
As it turned out, by sheer coincidence at the time the line was being transferred a fault had developed in the exchange box. This has now been repaired, the divert put on and normal service has now resumed.
All I need now is for customers to ring me.
I'm really pleased with this company (so far). Beforehand I was paying for my phones to a company which was considerably cheaper than BT, but was still paying a line rental to BT. Now line rental and even cheaper call costs are all included in the one bill. I particularly like that, as most of us transfer land-line calls out to our mobiles, whilst the cost of the diverted call is even cheaper than before, the cost of the diverted call is capped once the call is longer than 3 minutes. So if you are having to explain something in detail to a customer I now know with certainty the overall cost of my bill.
Overall therefore the cost of having two landlines will fall over the course of a year from about £1100 to about £650. Definitely not a saving to be sneezed at.
Thanks again guys for all your support.
Roger