In reply to Bottom Clinger:
Thanks for the tip, just back from Little Woolden Nature Reserve. As I was walking round I was thinking "this is a wash out" because it was dull and windy and nothing interesting to be seen beyond swifts and a few gulls. No dragonflies to be seen - presumably too windy.
Got to the west side and saw a bird flying for a few seconds several hundred metres away. It landed on a bank, was an adult Hobby. And then it just stayed there looking round. Got the scope out for a closer look, tried to take some piccies with the smartphone (I have an adapter now) but with the wind and the combined magnification being 100x plus to bring it near enough, couldn't get anything decent - best is attached.
Walked "past" it getting slightly closer (off the public footpath), eventually it must have decided I was too close (still 50-100m away) and flew off to another bank much further away where it stayed until some geese disturbed it.
First Hobby I've seen since I used to birdwatch as a teenager, and then the one or two times I did see one it was somebody saying "that's a Hobby" as it flashed past, so it was nice to get a decent view even if it wasn't strutting its stuff aerially.
Bonus on the way back was a lovely view of a Yellow Wagtail, once I got past it so the light was in the right direction - so yellow. Took a bit of time to work it out because it was in the top of a tree behaving like a warbler and I'd forgotten that Yellows have the shortest tail of the wagtails.