Can't praise the basic NATS/Aware unit enough for safely knowing, with the red warning changing from green where the controlled air space is on the CAA chart display.
Plus the nav help, from the 5 minute pointer, especially when closing in on a new destination.
Takes all the hassle away without having to to any plotting, apart from the regular chinagraph on the paper chart.
A winner at at £149 & free updates too.
mike.