1921 Census just released.

The next release will be in 2052. Think I'll wait for that one. 

I thought you had to pay to see the transcription as well, just at a lower price. This is from the FindMyPast website: "Viewing transcriptions costs £2.50 per record. 

Records can also be viewed as an image of the original document, viewing images costs £3.50 per record." (Some subscribers get discounts)
www.findmypast.co.uk/help/articles/360009238938-how-much-will-it-cost-to-access-the-1921-census-online-

For those in/near London, the census is available free at the National Archives at Kew.

(Just to note, I'm reading a lot of complaints about shoddy transcriptions, so if you search for a family name, be sure to look for any likely spelling variation.)

A possible census substitute for the period between 1921 and 1951 is the 1939 National Register, a pre-war inventory of people and resources.

I quite agree, we should write down what we know now because it will be more difficult for our descendants to get the info. I already have that responsibility with family photos and i am the only person who knows who they are! I wasn’t a particularly observant child but I do think I knew more about my family tree as a kid than my adult kids know now.
As for shoddy transcriptions, yes they had my grandad’s name wrong, an unusual name but still and you don't have to pay for finding an individual. But you do for asking for the actual census page with that individual on it.
They say they won’t do another census in this way. Too difficult. Shame really.

Depends how underhand you want to be. Also remember there are sometimes good reasons why people prefer not to discuss their family backgrounds.

Presumably you know your parents' dates of birth and possibly their places of birth? So you should be able to order their birth certificates, which should have their parents' names and the address they were living at. From that you could look for grandparents' marriage records, which give ages and birth places, and you could then trace their births. You can search for free, but you need the certificates for the details, and they are quite expensive if you need a few (around £12 each I think).

Your local library might have free access to a genealogy site like Ancestry or Find My Past, so as well as births, deaths and marriages, you could use that to search for your ancestors on the 1911 Census (and older ones) and 1939 Register. If not available in the library you can usually pay for a month's access for about £10 on those sites.

The 1939 register mostly redacts records of anyone until they are 100 years old, so you might find a few of your family names blacked out if they were born after 1920ish. But it's usually pretty easy to work out who they are from the other people living in the house.

There's also the Mormon records site, FamilySearch, which is free but can be a bit inaccurate. From what I understand, the Mormons collect and transcribe genealogical records in order to retrospectively claim those souls for the Mormon heaven (Mormons please correct me if I'm wrong...) and that's resulted in a huge public genealogy database.

I have the same sort of issue. I know lots about my mother's family, and one of her cousins has done a lot of genealogy on her maternal family side, but my father has never been prepared to discuss his family so I know nothing about his side.

Well actually we should never see ourselves on the online information as they blackout people who are still living*. On that point, they made a mistake with my mother-in-law. They've blacked out the wrong person in her family so, although she's very much alive, you can see some of her records.

*Actually I've just thought I'm not an expert - they do that for lots of info but for the census??