ADSL2+ (up to 17Mb) is now the standard ADSL offering.
Good choices of ISP for speed, reliably and customer services are Zen, Andrews & Arnold (AAISP) and IDNet. Click here to open a new tab where you can compare ISPs. The better providers like those listed have contract terms of 1 month, others trap you into a 1 year contract, so check the contract term before signing up.
Numbers 01275 39**** in the Failand triange area are on the Long Ashton exchange. Numbers 01275 37**** in Lower Failand are on the Pill exchange which is actually located towards Abbots Leigh. A few properties with numbers 01275 85**** in the Charlton Drive area are on the Nailsea exchange.
You can tell if you have ADSL2+ from the status page of your router. It will say "G.DMT" if the line is ADSL but ADSL2 if it is ADSL2+.
Migration to ADSL2+ from ADSL is only recommended if you have a connection speed of at least 6M, so would not be in Failand.