Hello.  I think I was flashed the other night on the M25 anti-clockwise between Jct 15 & 16.  There were several cars around me and we were all moving at about the same speed.  I was surprised at first because I was trying to stick to 70mph as I thought this was the limit.    When I was flashed I looked down at my speed and it read 74mph.  If I assume I had instinctively backed off when the flash went off I guess my real speed may have been between 73-75mph.