Try the Rake in Haslingden, National Hill Climb Champs venue then if that's not enough to do you in, go over the Grane Road towards Blackburn. Failing that, through Edenfield, through Bolton and up Sheephouses in to Darwen, should be enough to keep you busy!!
The Peak District is just round the corner! Just went over to Holmfirth the other week, where they film "Last of the summer wine" and there's a few good climbs round there.
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The climb from Hebden Bridge towards Keighley is about 4 miles long.
A similar question was asked in this thread recently. We listed lots of good climbs there.
Interesting route: http://tinyurl.com/dxhp8c