Hi, I'm new here, but I've been lurking for a few days reading the posts. I've got young kids and like many of you have found that I'm spending far too much time re-watching Our Girl! I thought I if don't speak up now I never will!
I agree with so much of what's been said about the sexual tension but I also think it's a huge amount to do with the chemistry between the lead actors - it's electric. You do end up wondering if it spilled over into real life, if not it's brilliantly played. The looks, gestures, non-verbal stuff is so right, is so how we'd all like to be admired, I think for me that's part of the fun. You end up wishing yourself into a scene (I know I'm sad, but I'm just going to say it!).
I've just been re-watching the scene in the medic's tent where she's drying her hair as it's the tipping point for him where he makes his feelings known to her. Watch it back, this is how I see it so far...she's aware she fancies him, but as her superior she know's he's off limits, but she's joined in on the coco-pop flirting, gained respect for him as an individual through his actions as her boss and demonstrated to a degree, her interest in him by turing back and catching his eye where possible. But for her he's never going to be within reach - in army terms but intellectually and socially - (plus think of her childish ex-boyfriends and back of take-away encounters, contemplating a grown up relationship is a completely different ball bag!).
I think the Rosbaya scene is where things change, he let's his guard down and is himself, not her boss. For me, he uses the coffee as an excuse to spend time alone with her and he ends up admitting his feelings through his use of language - ' adore you for always' & 'come back to me' - and by caressing her hand. I think she's taken aback, watch the performance from LT, she plays it initially as if he's joking he and she's flirting back at him - 'for always' - but her expression changes as the realisation kicks in that he means more and his touch and hesitation only goes further to confirm this. I remember watching it the first time and how fast my heart was beating. I think the repressed emotions spilling into something that's more 'real' are palpable!
Sorry, that was a bit of a splurge of thoughts and ideas...