Embarkation advice for new cruisers

We are booked on Braemar from Dover on the Norway Winter cruise next month. We have car parking booked with Relyon and will be transferred by them to the terminal. Any advice regarding timing our arrival for a stated 1300 to 1530 embarkation time would be appreciated. Thanks.

We used Relyon at Dover and they were very efficient. I would say from arriving there we were at the terminal in 20 minutes.

Thanks - very reassuring.