Screws will be perfectly adequate. For sure buy a nail gun if you think you'll get much use out of it long term but screws, nails, it will make no difference to what you end up with.
Overthinking this a bit, a few screws angle skewed into the wall plate will be fine, remember it will all be tied together when you fix the deck to the joists and the presumably you're gonna fix a member to the end of the joists behind the fascia.
No I assumed your point was from a cynical perspective but in reality we do need such beaurocracy, their effectiveness and handling is another subject.
No. The indemnity only covers the legal fees associated that you might amass during legal proceedings. It absolutely does not pay for any remedial costs, no doubt your solicitor has failed to mention that.
In anycase it's irrelevant, you're beyond any time limits. Have a google as to how often...
An indemnity is merely an insurance policy that covers your legal costs relating to any prosecution costs you might be liable for if the planners decided to prosecute the new owners for a breach of planning. Which won't happen because it's beyond the timeline.
20 years is a nonsense. However in...
An air gap in a first floor ceiling is unnecessary, loft legs are OK but don't really spread the load as effectively as fitting additional joists to increase the height. Also consider the 'loftzone' system.
BTW screwfix links don't link properly from this site as DIYnot has some weird link to...
That looks to me like three standoff bolts have been connected together to make the door stop taller. So I would expect them to undo. How much have you tried turning them? Are you using the correctly sized spanner?
Flood Control International are based in Tavistock, though as a world wide company this may be too small fry for them https://floodcontrolinternational.com/contact/
Or maybe https://premierwatersolutions.co.uk/contact/