You'd need a 32 point swing from labour and the greens to the Tories to make this representative as the polls currently stand.
There are a few of that magnitude in British history - most being to the SNP in 2015! Caught me by surprise, didn't realise quite how momentous a shift that was.
Any of the politics watchers in this thread might like to look at Uxbridge and South Ruislip - Boris has a majority of 5000 and Labour appear to be doing well at the Lib Dems expense. That'd be hilarious if they upset the seat but the Tories got a majority