Heathrow - China - Macau- Hong Kong

I have the chance of going away for 1 week and was wondering if this is doable.

The itinerary would be flying into Shanghai for a connecting flight to Hong Kong, stay in Hong Kong and travel into Shenzhen for a look around and then onto Macau.

The return flight would be Hong Kong to Shanghai for a connecting flight and then back to Heathrow.

Regarding the visa free visit, would I qualify?

Any response would be greatly appreciated as I have never done this before.