Ben filming with Martin or Andrew? And Martin/John apparently taken prisoner?

From what I’ve heard Benedict was most probably shooting scenes inside the cottage for the bigger part of yesterday’s filming. We can’t be quite sure with whom, but there are several clues.

Andrew is a possibility.

He was seen stepping off the helicopter later in the afternoon. The scenes inside the cottage which have been filmed in the morning could have followed this arrival scene, timeline wise. I’d carefully say possibly(?), but I don’t know how likely this assumption is. We saw him facing the older, balding actor in the dark suit, and having scenes with his goons. Meeting Sherlock in a fisherman’s cottage was probably not on his list that day. But who knows?

Martin is even less likely.

He was spotted in Cardiff around lunchtime, and was reportedly filming the last scene of the day. So he arrived too late in Southerndown to be filming scenes with Ben in the cottage. On the beach he was possibly shooting some sort of hostage scene? (Really, Mofftiss? Booooring,… Moriarty’s back and John is taken hostage? How original…) But again, these are mere speculations based on first impressions.

The only one who was on set AND was not being seen filming on the beach was Loo Brealey.

We know she was present in the morning when they were filming indoors. We know she was in costume as Molly Hooper.

We only saw her in the audience during the beach scenes in the afternoon/early evening.

As far as we know she hasn’t been involved in those scenes.

Why was she there in the first place?

I conclude that it was her who had scenes in the cottage with Benedict.