China Visa Celebrity Cruise

Dear Sir/ Madam,
We are Spanish residents in UK (will we need to ask for the visa in Spanish or UK embassy?) and arriving to Shanghai on the 23rd March 10:00, we will be in Shanghai till the 25th 10:00 when we will go on board a Celebrity Cruise and it will depart that same day at 17:30.
Then we will be two days at sea and then three days at Beijing.
Will we need entry permit (standards/double entry)?
Thank you very much