The original suggestion was that all you needed to do to get around the restrictions was to drive to the Hook of Holland. As Maurice accepted that is not possible with UK restricting entry into the UK from Holland without isolation. The same rules apply to Belgium, France and Spain so unless you intend to drive to Germany and catch a ferry back from Hamburg then whether you stop or not in any of those countries has no bearing on what you have to do when you drive to return to the UK from Spain, France, Belgium or Holland.