Several months ago I stopped to chat to a fella who was hunkered down on a low seat overlooking the Ravensbourne right outside Elverson Road DLR station.
I spotted him first on my way into Lewisham - he was facing the bit of the river that's barely visible from anywhere else, where it runs in a wide concrete channel behind the rail station and into Brookmill Park. At first glance I thought he was fishing, and given the level of river water, that he was also hopelessly optimistic.
But on my way back I saw he was watching a camera on a tripod in the river bed, so I stopped to have a chat and he told me all about his kingfisher watch. He told me that he spent several hours a day trying to get good photos of them, that they covered large distances along the river looking for food, he showed me their favourite perches and told me other places that were good for spotting them.
I was surprised and delighted to hear that there were kingfishers on this stretch of the river - I've only ever seen them down at the end of the Creek although given their range it was probably the same ones! - and impressed by his dedication to something he had such a passion for.
Tomos and his kingfisher photos were featured on the One Show yesterday and you can watch the clip here.
Some reporters get all the best jobs - crouching in a concrete culvert for three hours wearing a bin bag. Luckily they did get a sighting!