Northern Brewer would be great for the bittering. It's 9ish %.
You don't need a high alpha for the bittering. The idea is that using a higher alpha hop at 60 means you'll get less flavour from that addition, but all the bittering. This isn't really true. The more hops by weight you use at 60, the more of its flavour comes through.
So, if you use 2oz Fuggles (4.5% AA) @ 60, you get the same bittering as 1oz Northern Brewer (9% AA) @ 60, but since there's more hop matter in the Fuggles, you'll get more of the flavour from it...more so than with the NB.
In any case, use whatever you like. An all-Fuggles bitter is great. NB with Fuggles is also great. If you want to stay close to style, just pick English hops varieties.