https://maps.nls.uk/geo/explore/#zoom=16.253038065143457&lat=51.47420&lon=-0.27421&layers=193&b=1
I’m going to wager, it’s just north of the boathouses.
I don’t think grasstracks are mapped. Sandford on Thames is if you know it’s position in relation to the town.
https://maps.nls.uk/geo/explore/#zoom=15.475634332977158&lat=51.71068&lon=-1.22909&layers=193&b=1
does the Danish government still fund some kind of junior speedway. I may have dreamed it, but thought I read they subsidised Danish kids on speedway bikes?
I can’t find any trace at all on the old maps.
if anyone fancies sharing the pain of searching this lot
https://www.britainfromabove.org.uk/en/search?keywords=Kew&country=global&year=all
Belle Vue
https://maps.nls.uk/geo/explore/#zoom=16.076667081490275&lat=53.46487&lon=-2.19374&layers=193&b=1
Armadale https://maps.nls.uk/geo/explore/#zoom=15.17619768421589&lat=55.89722&lon=-3.68275&layers=193&b=1
Sun Street Stoke - https://maps.nls.uk/geo/explore/side-by-side/#zoom=17&lat=53.02182&lon=-2.18703&layers=10&right=ESRIWorld
There appears to be two cycle speedway tracks nearby now, one appears disused.
Canterbury must have been here - https://maps.nls.uk/geo/explore/side-by-side/#zoom=16&lat=51.28882&lon=1.08442&layers=193&right=ESRIWorld