Definition of Transit

I will be flying from London to Singapore, Singapore to Shanghai and then Shanghai back to the UK. In the description above there is reference to onward flight to a third destination and valid visa for that third destination. Yes, my country of origins prior to entry and destination on departure are different, but my ultimate destination is my point of origin (one for which I do not need an entry permit, so do I qualify?

(My point being that I am in transit back to my home country and not to a third country destination...)