Compared to many other countries, UK has a computer science culture that's very open about how technology is used in every day lives, and it invites public participation in new tech. This shows a lot in the government as well as its services like BBC and NHS, and the academia.
It's a very broad topic to cover so I'll be terse with evidence/examples only. UK government provides a lot of open data and APIs for the country [0], [1]. They are free and pretty much not throttled. They have a license [2] for a lot of this data which is formal but nearly as free as John Carmack's legendary hacker-friendly "have fun" license [3]. There is also a lot of historical Ordnance Survey data and historical legislation data from the National Archives. And of course, you can see the openness in how they have built gov.uk, as blog articles appear on HN about it quite often.
There is also a lot of government infrastructure provided to local governments, such as gov.uk Notify [4] or a freely available NHS website CMS (which is why many NHS websites work the same). There is a guide [5] mostly intended for government services but free for others to use on building accessible, secure and quite good-looking websites.
Most other governments I lived under are either technically behind UK or they have very advanced tech capabilities in certain branches of the government only (such as the armed forces) but keep it out of the public eye. Ultimately, I think it is the culture of welcoming everyone's participation in technology that makes UK gov so forthcoming and open with their tech and data. Doing this is seen as kind and civilised, which is how governments want to be seen. Of course, there are still areas of improvement in how UK gov provides data, as there always are in everything.
Finally, I should mention you can find many BBC technology outreach programmes from the early days of home computing. They are all over YouTube if you search for "BCC home computing". There was and continues to be a lot of techno-optimism in the country. It is one of the admittedly not many things that persist from the pre-austerity times.
[0] https://www.data.gov.uk
[1] https://www.api.gov.uk/index/#index
[2] https://www.nationalarchives.gov.uk/doc/open-government-lice...
[3] https://github.com/id-Software/DOOM/blob/master/README.TXT (before GPL became popular, id software code was distributed with this readme that said "Have fun")
[4] https://www.notifications.service.gov.uk
[5] https://frontend.design-system.service.gov.uk