Hi Jelv
Ive checked the BT Wholesale database and BTw is reporting as 20CN and only 8Mbps available for STMERE
I suspect what may have happened here is that TT may have recently LLU'd the exchange which is why such speeds are available from TT.
I use Sams database for the LLU exchanges, which in turn relies on TalkTalk advising him which exchanges they have upgraded. AFAIK they tend to do this periodically in a bulk process, so they may not have done so yet which would explain the difference.
Ive contacted Sam and asked if he'd like to make a manual adjustment to the TT database list for Mere. Thank you for letting me know.