From the notams:. .1100-1215 1000ft agl (H941/02). .Formation of up to 10 hel will fly via heli-lanes fm RAF Odiham. .5114N 00057W (1100hrs) - H7 Banstead 5120N 00013W (1115hrs) - H3. .Barnes 5129N 00016W (1132hrs) - Isle of Dogs 5129N 00000W. .(1150hrs) - 5137N 00003W - RAF Benson 5136N 00106W (1215hrs). .Acft to avoid formation by at least 1.5nm either side of track. .Tel: 02894 456639. .. .Steve R