not sure where to post this ...feel free to move it to the relevant thread.
received the email newsletter from them and here's the new rules on the lens and tripod restriction:-
Cameras and Tripods
Thanks for your feedback here and again we have some positive changes to report. The restriction on lens focal length and tripods (including monopods) has been removed. However, tripods and monopods may not be used in grandstands or in locations where they may block other spectators views. All are now allowed subject to a strict personal use policy. The rights to all images belong to Formula One Management Ltd, and cannot be used for any commercial purpose without the express approval of the company. By agreeing to enter the circuit, you have agreed that the images captured are solely for your personal (amateur) use only. We reserve the right to remove any photographic/videographic equipment from the park should we feel are meant for commercial purposes.