a8ree,
The delay is down to Line Port > Ring Delay. The default is 4000 (4 seconds), this suits North American Caller ID which arrives between the first and second ringing cycles.
I know that you are in the UK using British Telecom for PSTN. The first change you should make is to:
Line Port > CallerIDDetectMethod - set to FSK(V.23)
Then experiment with Line Port > Ring Delay. I use 2000 (2 seconds), but I don't use British Telecom, so you may get that down further. If you don't care about CallerID you can set it to 0. However, I would suggest that CallerID is useful, particularly for dealing with nuisance calls!