I found Elstree very unfriendly when I was a PPL. For example, we were not welcomed into the bar and the general attitude was one of willy-waving. Denham is friendlier but you have to fly a long way from the overhead to do your training and there are no real facilities (food etc). Think about driving a bit further and saving time and money in the air. Wycombe is good and White Waltham is even nicer with a great restaurant and not a lot further round the M25. Stapleford is really friendly, professional and has a restaurant/bar etc. If you can face the drive, Little Gransden is half the price of Cabair with a great club environment. Suggest your nephew goes visit all of these and makes his mind up based on the reception he gets.