368 seats are so safe the Electoral Reform Society has already called the result in them.
•25.7 million voters live in safe seats.
•79.3% of constituencies in North East England are safe seats, with 77.8% in Northern Ireland and 70% in the East of England.
•225 constituencies have not changed political hands since before 1950 and some not since the 19th century!
Source: Electoral Reform Society (ERS).
As the ERS used to say, the Single Transferable Vote (STV) voting system would solve the problem.