@Hero0, your house looks lovely and you are certainly offering the room at a very competitive price. I could be wrong, but here are some suggestions:
1. The price is too low. When I see a space with a private bathroom, in a Victorian house in London starting at £15 a night, my first thought is, what's wrong with this place? What's the catch? That price automatically makes me think your place is not so nice, e.g. maybe the street/neighbourhood is horrible (I know your area by the way as my cousin lives there, but many visitors will not).
2. The fact that you have a toddler and especially that you mention that he can be noisy and guests must keep noise down after 7 pm would put a lot of people off booking, but there's not much you can do about that! It's a bit far to walk to the tube, but again, nothing to be done about that.
3. I think there is a lot of room for improvement in the photos. You have many nice verified professional photos, so why use so many additional ones that are not as good? Why 54 photos? I would get rid of most of the photos from no.30 onwards, especially the hallway shots. They are not doing anything to sell your space and you already have 29 mostly great images. That is probably enough. Sorry, I don't mean to be critical as you have a lovely space and maybe prospective guests aren't even scrolling that far, but I'd remove the below average pics just in case.
The house looks lovely and full of character, but there's something a bit plain and uninviting about the bedroom part of the space you are advertising (bathroom looks great by the way). Could you maybe inject a bit more love into this space, e.g. some pictures on the walls?
The exterior shots of the house aren't helping you. They were taken on a very grey, gloomy winter day. I know it's a bit tricky at this time of year, but maybe take some on a bright sunny day with blue skies (then later take some when the hydrangeas are in bloom rather than dead!) and NOT when the neighour's bins are lined up outside. Take a clearer photo of Horace if you want to feature him! More tips on taking photos here: https://community.airbnb.com/t5/forums/v3_1/forumtopicpage/board-id/new-host/thread-id/20384/page/8
I hope that helps.