A few places in Salou will be closed but still enough open to have a good time. Reus, Tarragona, etc will be fully open. Most of the locals live in Salou or surrounding area. Weather usually OK but can get a little chilly at nite.
Ryanair will be flying to Reus in 2016 from selected UK airports. Check their website and info for details. Some routes are announced but schedules not loaded yet.