More Talk UK, a telecoms provider that I stumbled upon on my google trip last night.

Usual free calls between more talk uk customers
10.50 a month rental, includes 4.5p per 70 minute call offpeak to 01/02
14.50 a month rental, includes 01/02 off peak calls of upto 70 minutes each
21.45 a month rental, includes 01/02 all time calls upto 70 minutes per call

yadda yadda, if your interested, go google it I dont wanna put a link here coz im not connected with them in any way..

Usual free calls between more talk uk customers
10.50 a month rental, includes 4.5p per 70 minute call offpeak to 01/02
14.50 a month rental, includes 01/02 off peak calls of upto 70 minutes each
21.45 a month rental, includes 01/02 all time calls upto 70 minutes per call

I can pay BT £10.49 per month and get free caller ID.  Granted though that each call is 1p cheaper, but you may also lose the right to route your calls through an alternative carrier.  Also, if there's a fault on the line you have to report it to Talk uk, who then report it to BT.  The general opinion is that it's not worth switching from BT for line rental to save 50-75p per month, and it's certainly not worth it to be paying the same price!!

£14.50 represents a £4 charge for calling landlines in the evenings and weekends.  There are other places around that give it free for no monthly charge.

£21.45 is an extra £9.95 per month.  It might be acceptable for someone constantly on the phone all day, but there are cheaper options around.  I think Tele2 only charge around £7 per month.