Cost of Tourist Visa to China if applying at Consul

My wife and I are planning a trip to the Far East on a cruise ship that includes the port of calls Hong Kong, Shanghai, and Beijing. I assume we can apply directly at he Consul for a DOUBLE entry one (this would presumably include me and my wife). Can you please advise what the cost would be if we apply directly at the Consul in Edinburgh ? Also can you advise if my wife and I would both have to be in attendance at the Consul or is it possible for me to bring the application and passport details, etc for us both.