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To meet the 77% target you would have to upgrade the entire building stock of the country, to a level which even buildings being built to the current Part L requirements would struggle to achieve.

While 2050 appears a comfortable 38 years off, this would mean an absolutely masisve amount of investment being required on the many millions of buildings in the country, many of which are not readily adaptable (it might be cheaper and simpler to knock most of them down).

It would also need to be balanced with the need to generate energy, but just where are all those solar panels and wind turbines going to go?

Unless the government comes up with a credible plan as to how this is to be funded and managed I cannot see any realistic chance of a target coming even close to being achieved.