It is a legal requirement to have a paper chart for a flight in the UK - ANO 2009, SCHEDULE 4 Articles 12(6) and 14(2).
Frankly GPS nav is great and the way forward, however it should never be taken for granted that it will work. Reading a paper chart is very reliable, difficult to disrupt and not prone to external jamming or equipment failiure
It will be interesting to see if the CAA take kindly to anyone who says something along the lines of:
- My GPS stopped working whilst enroute, that's why I infringed the Olympic Zone
- I don't carry a chart anymore, my IPAD has replaced that
- I always do my planning on the GPS and it should not have gone off - it's not my fault