According to Rachel she was facing the apartments. According to Kate Rachel was seated almost directly opposite Gerry. Perhaps he was seated with his back to the table?

BRILLIANT.
Thank you Gunit ... once again you have helped solve something that was worrying me about the case.
There were nine people in the Tapas group, so when they were sitting around the 360* table, they were placed at 40* intervals [360*/9 = 40*]. Fiona had her back to the plastic curtain wall. Gerry was at 40* to it. .
When talking to Fiona, Gerry was virtually looking at the patio of 5A, because it was almost directly behind her.
A photo of the petite dark haired Rachael below standing immediately behind Kate and Gerry. It shows how much shorter she was than Gerry.
http://www.gerrymccannsblogs.co.uk/2-4-11/10472805.jpg
Fiona was shorter than Rachael as you can see from this photo
[This is beginning to sound like a Ronnie Corbett and Ronnie Barker sketch ]
http://www.gerrymccannsblogs.co.uk/Tappas9/RachelOldfield-FionaPayne-RussellOBs.jpg
From these two photos, you can see just how much taller Gerry is than the petite Fiona sitting next to him
With Fiona being so petite and Gerry being so tall, he could see the illuminated patio area, even over her head. When talking to Kate, he could see the illuminated patio to her left. And he was well positioned at the slightest turn of his head to see 5A patio at any time. Who knows how often, as a very obviously devoted father, he checked 5A visually?
Gerry sat at one of the best positions to keep an eye on 5A, I am thinking
Thanks to you, Gunit, another bit of the jigsaw almost certainly solved. Well done.

Methinks we make a good team, keep em coming.
