There are now 5 cabinets in Suckley, 3 were added for network rearrangement. It is not inconceivable that you have been rerouted into another cabinet.
Thanks, I didn't know that - I haven't noticed any more cabinets but I haven't been out much recently! Is there a site that tells me where they are?
My Fritzbox report says the line length is 1524m, which sounds about right for the local exchange where I thought the cabinet was.
The BT availability checker says I'm on cabinet 2. It also says my VDSL line rate is (high) 13.4, which (as far as I recall) hasn't changed for years. Certainly I'm doing better than that now.