Its not always sunny or windy in this country and bulk electricity is very expensive and difficult to store for medium to long periods. Very little is stored in bulk at present. Most people don't want a wind turbine close to their property, although quite happy for them to near other people's houses. Most of the land based sites have been developed.
Tidal has been talked about for 50 years, but there doesn't seem to any commercial progress yet.
Hydrothermal isn't that for countries that are on the edge of tectonic plates i.e. not UK.
I can see decent progress on renewables but not enough to replace all the oil, natural gas, coal, Pre 1992 nuclear stations, by say 2040.
There needs to radical actions on new homes to make them make them completely carbon neutral. 240,000 new homes a year would over 15 years make 3.60m carbon neutral by 2036.