I ended up putting my switches in a MUD dash pod
The MUD Pod is another MUD designed solution that solves the problem of how/where to mount extra switches, controls and gauges into the Defender dashboard. External Dimensions (L) 340mm x (D) 109mm x (H) 80mm The Recessed facia panel dimensions measure: 312mm x 62mm Each MUD Pod blank moulding...
www.mudstuff.co.uk
Just a word of warning about the item in the picture, i got one of those to install in the back in a custom shelfing box i built and i found a few of the crimps were loose on the prewired harness.
Before you start with it, i would recommend recrimping everything or try pulling the wires to just check, last think you want is a live wire rattling around in the dash