Two helicopters

On my return from work, I spotted several aeroplanes and helicopters flying in formation over the fen.  Apparently they are practicing for the RAF centenary celebrations on 10th July.  then after lunch, a Chinook flew low overhead while I was out walking. Coincidentally, the Electricity helicopter was hovering over the fields doing its power line checks.  I think it might be a Juno but I am no expert.