That's what I've always believed too - 150 used to generally be UK based and easier to get through on
BT have had a lot of systems outages lately though, so may be they are just tied up in calls for longer than normal
around 2 months back had an issue with "stuck Bras Profile" took a week to get uk bb support. asked them best ways to reach them in future and they said 150..
One shocker is:
BT BB HOME support india HAVE no idea what a bras profile is.
BT BB Business support 2nd line, have no idea what it is.