Tbf, the team behind .gov websites has been exceptional and I think that part of the digitization of government services has been done really well. So I think it's definitely possible - the question is will the government do that, or will they pay someone few billion quid for an off the shelf solution from a company owned by someone's uncle/brother/cousin that will be a flaming mess.
It’s not the technical expertise that is the concern.
It’s what the UK government has shown time and again when they ask for more data: they use it for previously denied-aims to expand their surveillance state.