No interactions present.
The green back combined with black crown and bib confirm this as a great tit. The black strip through the belly must be there but not visible at this angle. It's not very wide on a female anyway.
I'm pretty sure they are Great Tits, stripes and all. As soon as I catch one a bit closer, I'll take some more photos to show their fronts.
I've been ringing some recently which have barely had a stripe at all. As Bob says, females have a relatively narrow stripe at the best of times, but, when moulting as well, it can sometimes virtually disappear, for a short while.
My Flickr photos...
Lat/Lng: 52.0, 1.1
OS grid ref: TM1645