The official notional election results will be published by Professors Thrasher (Sky News) and Rallings (ITN) sometime later this year, my guess is certainly before the end of the year, but thanks to the House of Commons publishing a similarity index, a friend of mine has sent me the following unoffical calculations
Unoffical Notional Electrion 2019
Conservatives 371 seats
Labour 200 seats
Scottish National Party 48 seats
Liberal Democrats 9 seats
Plaid Cymru 2 seats
Green Party 1 seat
Speaker 1 seat
Northern Ireland Parties 18 seats (DUP 8, Sinn Fein 7, SDLP 2, Alliance 1)
Conservative majority of 94 / 100 when allowing for Sinn Fein and Speaker(
It would be helpful to see plusses and minusses with this chart to show how many seats each party notionally gains or loses compared to 2019. Of course the swing in the next UK election is likely to be so massive that all of this will be swept away anyways.