Hawarden used to have a big airshow every year, I remember going as a youngster. It was still British Aerospace then of course. The highlight used to be the Red Arrows and of course, the (sadly crashed) Mosquito. Not sure when they stopped doing them. But I deefinately remember an Airshow there annually throught the 80s.
Completely agree though, other than Southport there's a lack of NW Airshows.