Business is obviously different. I have two friends one on adsl and the other on fibre and they both get slowdowns in evenings. Noticeable but not catastrophic. Main reason I don't recommend TT fibre is the 2mbps upload.
I'm getting line speed throughput on TT ADSL, 24/7. Obviously this stuff is sometimes regional, but it all seems fine here.
I do agree with you on the poor 2 meg upload on TT's 40 meg FTTC offering though.
Oliver.