Dean, firstly, welcome to the forum.
Secondly, in your situation you'll find that Barston Lake will suit your Dad's needs far better than the Riddings.
At Barston you can drive to, and park behind, many of the swims. Also, the fishery is all on one level, unlike the Riddings. Midweek visit? Avoid the weekend contests.
Enjoy and please give your Dad my regards.
Ian