Caught the end of this on coutryfile this morning;
Apparently one of the best kept areas of natural grasslands is owned by the Army (portland downs if I remember correctly). No chemical fertilisers have been used on it for over 80 years and it has over 2/3rds of the species of butterfly native to the UK present. Not to mention a whole host of other indigenous wildlife.
Ironic considering that it is the british armys chemical weaponds research base