Rolex UK Service Centre Protocol & Costs

[NickTruswell]

I'm approaching the point where I need to get my Z serial Datejust and M serial Submariner serviced. This is the first time i've had to service any of my watches and wanted to ask the UK members about the protocol for getting them services by the RSC UK which I believe is in Kent. My questions are;

Can you send the watches direct to Rolex or do you have to do it via and AD?

How to you send the watches as it's too far away from where I live and more importantly how do you do it securely?

How long does it take?

How much does it cost??

Thanks in advance for any help/info you can give
cheers
Nick