ISDN2 got my vote too.

In reply to a post by JonRennie:

You assumed ISDN30, I assumed ISDN2...I wonder which it is.

Surely it depends on the size of the company and what type of switch/telephone system they have

Not necessarily.

In reply to a post by Zarjaz:

Not necessarily.

The point I was making is you don't see a ISDN30 (aka DASS link) on a 2+6 switch or a ISDN2 connected to a Meridian Option 81 switch for example.

Could be either, I just assumed that any company considering a leased line would be using ISDN30 ( 2Mb DASS or I421) rather than ISDN2 ( 2-6 channels, 128Kb to 384Kb)

Still think best bet is ask for the FTTPoD quote then make a decision, as leased line is likely to cost very similar for anything over 10Mb..