Thanks! It was from Nettley's Hide but it was a lucky encounter according to the volunteers there. If you want guaranteed Kingfisher shots I'd visit Warnham LNR and plant yourself in the Tern Hide.
The hide is very close to the action with lots of natural perch points arranged right in front. Over summer they have terns which are great to watch.
On another note thank you for the black rapid strap suggestion. Whilst searching for it on amazon I ended up getting a cheaper "focus f1" shoulder strap with an additional tether. I wore it for approx 6 hours on Thursday. Comfortable and robust and it all came to £18. No back pain!