I don't think there is.
Starmer asked for evidence of the 10pm curfew to be published and on what scientific grounds was it imposed, and I guess as a result of that will be the results of how effective it has been. Not very, I'd imagine, considering they're thinking about further lockdowns and restrictions in the north, which I think is grossly unfair.
I think I read the other day that Boris' own constituency (Uxbridge) has a higher infection rate than those that have been in lockdown throughout summer, yet that have been no further restrictions placed there. As @The Artful Dodger says, it is wholly political and I don't get what Tories gain out of this other than further hatred and resentment back on them. The decisions don't make sense outside of the political alignment.