Love and appreciate a good cafe recommendation!!
Puddleducks in Dunsop Bridge (good bike racks, range of tools and if it’s chucking it down they’ll even put your kit in a tumble dryer while you eat!)
Riverbank Tearooms in Slaidburn (just by the bridge over the river)
Garden Centre one in Wray, already mentioned.
The Hub at Gisburn Forest
And if you venture to the very western edge of the Trough, there’s a little village called Scorton which has a big cafe / farm shop place called The Barn at Scorton. It’s a hugely popular cyclist stop and has covered bike racks, track pump, basic tools and so on.
Just note that cafes/shops outside villages are few and far between, there is almost nothing out on the road. Churchyards are a good bet for outside taps if you need a water refill though.