and (I assume?) not subject to the 1 per hour limitation... bookmarked 
Wrong assumption!
The Service ID is: BBEU03522XXX
This is a 21CN line.
Looks like BT refused to test, possibly because a speed test or BRAS check has been run recently which prevents this tool from working. Try again in a few hours.
Tho' I don't remember using the BT speedtester since yesterday at latest.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 19 Meg WBC