This will not be a Tory walk over it will be more contested than people think. Labour have policies that are attractive on the face of it - the idea that simply taxing the rich will support it all makes no sense. The biggest asset the Tories have is Corbyn - last election he was an unknown face and he was up against May who was by far the worst leader/campaigner the Tories have ever had. His impact will not be as positive as it was in 2017.
Labour's Brexit policy is also an issue - how can you agree to negotiate a deal and then campaign against it? It can never be a credible deal. They have consistently blocked Brexit which will not sit well.
The other issue I see for Labour is the number of prominent women - this is not a sexist comment - Abbott, Thornbury, Long-Bailey, Angela Eagle, Dawn Butler - these all come with baggage that will be exposed in an election run up. The less said about Jess Phillips the better
We haven't mentioned Anti-Semitism.