This local council seem to be taking a hard line.
I know planning laws restrict what you can build in front of your house, but this little shed is well made and looks good to me.
Compared to the terrible things you sometimes see in people’s gardens.
https://www.bbc.co.uk/news/uk-england-leicestershire-57077470
As the link says, it is a Conservation Area, no doubt with an Artcle 4 direction. Conservation areas come with benefits*, but there are restrictions to maintain those benefits. Normal planning and development rights are limited - with good reason.
* eg visual amenity and property prices.