Depends how long ago your PN experience was. Before ADSL Max and similar, there were 50:1 and 20:1 contention ratio products from BT Wholesale.
With the introduction of variable rate ADSL,( the Max type products), that concept went out of the window. Unfortunately many ISPs seem not to know that
Instead, there is a prioritised/prioritising product from BT Wholesale, which apparently does push traffic through the exchange faster, as stated in the IDNet SuperMax product description. I believe that priority extends further into the backhaul.
Further complicated by the fact I expect you are now on IPSC, though that's just a guess. This is an extract from the IPSC documentation:-
All BT IPstream Connect products are provided on shared infrastructure. The BT IPstream Connect Office /BT IPstream Connect Max Premium products have priority, through the shared part of the BT IPstream Connect network, over the BT IPstream Connect Home /BT IPstream Connect Max products. During a busy period a BT IPstream Connect office or BT IPstream Connect Max Premium product will receive a higher downstream throughput than the equivalent BT IPstream Connect Home or BT IPstream Connect Max product.
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