There's some good content, as ever, to keep an eye open for:
Judy and Kevin Cartwright's delightful wartime Brixham Bay in N gauge.
Pete and Julie Goss's 'Worlds' End' - you won't find better architectural modelling than this.
And, in my opinion, one of the best layouts on the exhibition circuit at the moment - Pete Johnson's 'Canada Street'.
As the ground is usually soggy take car where you park, try and keep at least one driving wheel on the tarmac. Sunday is usually the quieter day, especially if you'll have kids in tow.