I think you should consider the winds you are likely to encounter when deciding upon an airfield...
Hawarden states in Pooleys 'Possible turbulence from buildings when westerly or easterly wind above 15 kt.' Which for the Tomahawk aircraft, makes it practically un-flyable above 12 kts.
Sleap on the other hand has open countryside and two runways. Flying their Cessnas is easy in any wind up to 20kts or more. They also have a choice of over 6 excellent aircraft, including their Cessna 172 SP, which has all the best kit.