These problems only occur when I hit the monthly cap. It is fine at all other times. Therefore, I'm quite sure it is not a problem with my modem. I'll reset it though just be sure. I'm satisfied that there is no noise on the line.

I have thought about fibre, but its a bit too expensive at the moment, and my ADSL speeds are normally pretty good. I had my line upgraded to ADSL2+, so can achieve pretty good speeds with that. My current modem can only support upto 8Mbps, but I have had it faster with a proper ADSL2+ modem.

Currently, we pay about £6.50/month with PlusNet. Data transfer is unlimited during the night, so I do most of it then. I probably manage about 20GB per month for free during the night, and just over 10GB per month of daytime usage. I agree that the 150kbps restriction is slow by todays standards, but I'd be happy with it for a few days if it meant a good price saving. However, I do still expect it to be reliable .