I use the following equipment:-
Firm stable camera and lens support is essential when using long lenses. I use a Gitzo G1348 carbon fibre tripod with a Manfrotto 405 Pro Geared Head (an absolute joy to use for landscape and macro use), and also a Wimberley Gimble Head . When unable to use a tripod, or working from a vehicle, a Wildlife Watching Supplies double beanbag filled with bird seeds does the trick perfectly.
Carrying and protecting your equipment is vital, which is why I use Lowepro. With their superb build quality and vast range to choose from, you can't go wrong. My own choice is a Pro Trekker AW II and Lens Trekker 600 AW combined with smaller bags. I take the gear I want from the Pro Trekker and transfer it to the Lens Trekker or smaller bags so that I can carry just what I need without lugging everything around with me.
Hides and Clothing
It is vital to keep warm while sat quietly in the midst of winter. Since investing in some excellent clothing from Kevin Keatley of Wildlife Watching Supplies, I have always remained dry, warm and well hidden by its Advantage camouflage pattern. I wear a 5 in 1 Jacket consisting of an outer coat, a water & windproof lining and an inner fleece (that are all detachable). With this I ware a pair of Six-Pocket Trousers, made from the same soft hardwearing outer material and also having a detachable water & windproof lining. In winter I use a pair of Thinsulate Mitt/Gloves and a fleece hat. I frequently use a Mini Dome Hide from Wildlife Watching Supplies. This has a sewn in ground sheet. The hide is quick and easy to put up and always provides excellent protection from the rain and wind, while providing good visibility from within.
Various Lee neutral density graduated filters, circular polarising filter, with foundation kit holder and standard and wide-angle hoods.