Driver in the wrong. Simple.
Highway code
Rule 129
Double white lines where the line nearest you is solid. This means you MUST NOT cross or straddle it unless it is safe and you need to enter adjoining premises or a side road. You may cross the line if necessary, provided the road is clear, to pass a stationary vehicle, or overtake a pedal cycle, horse or road maintenance vehicle, if they are travelling at 10 mph (16 km/h) or less.
Laws RTA 1988 sect 36 & TSRGD regs 10 & 26
Lol clearly a butt hurt dashcammer. Stop crying. His overtake clearly looks very dangerous, you know given how close he is to you and that its blind bend (sarcasm). Can see it's clear for a mile, he probably overtook you because he felt uncomfortable being behind such a twat.
Snobby bastard, you aren't that guy - humble yourself.