EE use the same BTw platform as PN but don't have their own network; they share BTw's.
Every ISP's speed estimator is based on the BTw database and is often pessimistic. I bet you'll get the same estimate from PN if you pose as a new cust.
Essentially, EE BB is excellent but their Cust & Tech Support is atrocious.
So providing you don't need the latter, it's a good deal.
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 20 Meg WBC