The Conservative momentum is almost as static, with a very very slight downwards trend. However, even the weak revert to mean being applied is still more substantial than this trend so the prediction is still a close VI result.
Looking at polling this week, it does look like this static position is very resistant to change, even after major news scandals. However, this includes an Opinium survey following methodology changes, that altered how they re-weight their figures. Opinium use a voter identification weighting, and base part of that on votes cast at the European Election. I doubt if that's entirely appropriate, as European Elections are not General Elections, and the voting patterns are not the same.