@DisgustedofManchester
3% of census forms are not returned. So thats 12 times the nimber of trans people there are.
How many women in Scotland? Well I'd go check council tax records rather than a ten yearly snapshot becuase council tax records get updated whenever a household changes. Work and tax? Ask the tax office probably, under 40? Council again. In answer to your ownquestion
No one uses census data. Why would a government department plan a picnic based on a ten year snapshot when it has almost live data at its fingertips. When people quote the trans prison population, you think they are relying upon the census? so funny
Why on earth would you check council tax records?
I've been responsible for paying this in Scotland for over 25 years. Never once has this included giving information on household members.
The council knows one name only - that of the account holder. Which does not even have to be anyone living there. (I know because I have been handling council tax for an elderly family member and the account is in my name, not theirs.)
It also, funnily enough has never included giving information on the sex of householders and residents because why on earth would that matter?
(If you can apply for council tax discounts and rebates, you may on occasion give the names of those claiming but those names are not kept as a permanent record, because they only ever matter for the council tax year.)