[JayB]

Sorry for your loss but it's great you have something wonderful to remember him by.

I have no experience of the Service Centre in Kent but as they list opening times on the Rolex website I don't see why you wouldn't be able to take the watch in person. Maybe give them a ring on Monday as they also list a telephone number.

Regarding having it serviced by Rolex or an independent watchmaker. I would be inclined to suggest Rolex in this instance, firstly you mentioned not being a watch wearer so it's extremely unlikely you know of someone you'd trust to work on it and also due to the high, sentimental value of the watch I wouldn't try to save a few pounds on service costs as I'd want it done properly.

Oh, and please post some pictures before and after the service