Transit Without A Visa (TWOV) from Zurich -> Shanghai - > London with only 4 days in Zurich

Hi I am a UK citizen and flying from Zurich to Shanghai on Thursday morning, and will be flying to London on Tuesday morning. So the trip will be a transit flight with less than 144hours in Shangahi, Pudong. I was advised that I can do a TWOV as my return flight and hotel accommodations are fully booked. I will fly into Shanghai Pudong on 2nd of September, and leave on 6 of September, which is 4 days ~96hours i.e. under 144 hour limit.

Can you confirm if this will be ok?
Best regards.
Avtar