Before everyone dashes off looking for grass strips to operate from, bear in mind that, for JAA training, there are still some significant requirements:
The base aerodrome, and any alternative base aerodrome, at which training is being conducted shall meet the following requirements.
(a) Have at least one runway or take-off area that allows training aeroplane to make a normal take-off or landing at the maximum take-off or maximum landing mass authorised, as appropriate:
(i) under calm wind (not more than four knots) conditions and temperatures equal to the mean high temperature for the hottest month of the year in the operating area;
(ii) clearing all obstacles in the take-off flight path by at least 50 feet;
(iii) with the powerplant operation and the landing gear and flap operation (if applicable) recommended by the manufacturer; and
(iv) with a smooth transition from lift-off to the best rate of climb speed without exceptional piloting skills or techniques.
(b) Have a wind direction indicator that is visible at ground level from the ends of each runway.
(c) Have adequate runway lights if used for night training.
(d) Have available a means of air/ground communications acceptable to the Authority.
Combine that with the Code of Practice (yet to be finally published) and the fact that the CAA are about to increase oversight of Registered Facilities and it's apparent that this is not a carte blanche to train anywhere you can find a friendly farmer.