I forgot to mention, despite being a veteran techy, I find the seat controls in F to be a case of style over function, and as such I don't find them to be that intuitive, particularly the modal knob function in some newer aircraft fit outs, where you have to press a button first, then turn the knob. Even down to whether I should be turning the knob clockwise or anti-clockwise I don't find immediately obvious, in the same way as plugging in a USB A plug. The industrial designer probably took cues from BMW regarding the single knob fixation.

Perhaps if I was five years old it'd all be obvious, but don't be afraid to ask crew for help... although sometimes they don't know them selves: BA is not alone in this in their F cabins.

The important aspect of the seat controls is setting the seat position for take off and landing: there's a light on the control console that needs to be green. In some aircraft like the A380 it's the light surrounding the knob needs to be green, and you need to turn the knob to achieve this. In other aircraft like the 787 with newer layouts you can hold down a single button to return the seat to the correct position.

Don't worry if you forget to reset the seat position, the crew will come around to resolve it for you if necessary without asking as it's a prerequisite for securing the cabin prior to both take off and landing.

I find the take off/landing seat position to be quite a recline, and as such I usually spend most of the flight in the most upright position I can achieve when awake, and certainly for dining.

There's a foot rest in front which will pulls out manually. If you're dextrous with your feet, and your legs are long enough, it's possible to pull it out with your toes while seated and strapped in. I've always assumed that this isn't to be deployed during takeoff or landing, but I can't remember seeing a sign explicitly stating this.

The monitor on the older style First such as on the A380 must be stowed for takeoff and landing, but will need to be deployed for the safety demonstration prior to takeoff. There's a knob above the screen that you slide towards you to open it. This design allows the use of the buddy seat, and was designed at a time when IFE traditionally wasn't enabled outside the cruise phase of the flight. In newer layouts, there's a larger screen that is permanently deployed, so you can watch entertainment from gate to gate, but there's no buddy seat facility.

I usually just use the IFE for the moving map, and have iPad loaded up with content: I find the IFE to be universally clunky and unresponsive on BA, which is as good a reason as any other to take your own device & headphones/earbuds.

Unlike the older 777 layout, the A380, 787 and new 777 layout enjoy generous at-seat storage in First. All the older 777 layout has is a small closet barely suitable for hanging up a string vest (although 1A/1K enjoy a slightly more spacious closet in case you have two string vests). On that subject, before getting changed, I ask the crew for a coat hanger to hang my clothes if there isn't a spare removeable one in the seat closet, and get them to hang my clothes elsewhere if there isn't enough space in the at-seat closet.

I've never had any problem finding space for carry on in the overheads in recent times in First even with a full cabin, but on the 787 I find that it's pretty tight lifting heavier bags into the overhead.