Zen's service in general is excellent. Failing that, one of the ISPs which offers a fixed peak-time / unlimited any time is good.
From my very quick guess math, I would need to go with something like 50GB peak time traffic at a minimum. Some of the provider packages that I have looked at come in at ~£35 for that amount and get a little steep after (Zen obviously have the 100GB package in that bracket as noted earlier in the thread).
What about plusnet with the £5 pro addon. This removes the throttling, therefore giving you 120GB daytime, unlimited overnight for the odd scheduled download.
From what little I have read about the add-on, some people seem to say it has made little to no difference.
Is the Pro add-on a monthly contract or do you need to keep it for the same length as the whole package?
How long ago were you with BT? I left BT in 2007 due to them wrecking my connection and going from a stable 8mb line to a 4max due to being port shifted to a broken line card. I was a lover of BT and getting a nice vision box package i was so happy but sadly it came to an end when they refused to fix my line issues and sort out a very old drop cable that was split & had been cut and badly joined.
I left BT but will always remember the good days of english cs in 2004/05 when I had a great line. I went to adsl24 & they were great & had to be the best isp although expensive, next stop o2.
O2 has great cs & english speaking which was a bonus but sadly a house move forced me to get sky. I have no issues with sky and so far their cs has been as good as o2 and I wished I lived in a fibre area but my friends have it & so far they love it.... GRRRRR I thin its down to luck really with any isp.
If you did go with sky, open reach come fit a new box on the wall for your fibre and essentially your using openreach equipment. BT now is just like any other isp with equipment in the exchange and despite fond memories its basically another llu isp.
I moved from BT to Sky in late 2006 if I recall correctly. Went from 1mb fixed to ~2.8mb service on Sky LLU (long line ~5km +). I did have a similar issue with my line before I left BT that left me with a very un-stable service for around 2 months. That wasn't my main reason for leaving though - I left for Sky as it was cheaper and the LLU system would allow me to get more from the line compared to the BT profile system at the time.
I know, irrespective of which FTTC service I choose (for now) that Openreach will provide the modem and maintain the line. I do however, as already mentioned above, know that Sky (or any other retail ISP - BT Retail included) need to chase Openreach for faults or any line maintenance works to be done. Sky have demonstrated to me already that they are less than willing to do so.