72 hour transit in china

Hi

I hope you will be able to answer my query

I am United Kingdom passport holder and will be travelling from Manila, Philippines on Air Asia flight to Guangzhou, China

I will be in Guangzhou for 36 hours

I will then fly from Guangzhou to Hong Kong on Cathay Dragon flight

Can you please confirm if i will be eligible for 72 hour free transit ?

Are there any restrictions i need to be aware of ?

Kind Regards

Avais