Sipgate still allow you the ability to change the CID number via the user portal, to literally any number you want.
I have to say this makes me think much less of Sipgate!
The cheap, pile them high, reseller VOIP provider I use doesn't even allow you to do this!
You can enter any number you want but they phone the number with an automated PIN before allowing it to be selected. If you do not enter the PIN you can't use it as a caller id number.
Surely if the regulator was serious about reducing spoofed numbers Sipgate (or any other company) should be told to get their act in order or they should have their ability to "use" UK numbers rescinded.
Let me guess the regulator is more interested in making the service more expensive for the public by allowing ISPs etc to print money and increase costs by £3/month each year. Who in their right minds believed when they said they would intervene with the inflation related increase we would seemingly end up on an even worse system than we had!