I had ADSL2 annex m (Be wholesale) for a brief period through another reseller who used Entanet to provide services, Very jittery and latency increases during office hours, Basically it was crap, certainly not value for money, Aquiss has a good reputation, they also charge a premium price for FTTC, if it where me if they refused to sort it out, or refused to release me from the remainder of the contract penalty free, i would be seeking help from their ADR ,
What i would do is run the BTW performance tester when your throughput is being crippled and run the second bit giving the IP profile, then it should offer a third test Tap3 , you have to change the user name and set the DNS servers to obtain automatically in your router then run the TAP3 speedtest, and take a screen shot of the results , this may if the result in normal rule out the BTW network , and be proof that entanet are throttling the life out of your connection , 2mbps is ridiculous, especially if your paying £37.00 per month for the privilege,dick turpin had the decency to wear a mask when he robbed you
As for who would be the best ISP a lot would depend how well BTW performs in your area,to some degree, as some areas have regular congestion issues that are sometimes not serious (throughput over 40mbps) on a 80/20 service syncing at the full rates, but are still a serious enough issue for those who experience them, your alternatives are SKY and TT have their llu kit in your exchange , though i wouldn't go with TT consumer, the buisness is said to be ok, and they wholesale it so it is sold be smaller isp's Sky doesn't do a business grade product,