1) It's not a climate change summit. It's the G7 meeting.
2) Driving to the tip of Cornwall would take about 6 hours.
3) There is no direct train service that would get you there from London.
4) It's more like 300 miles than 200.
5) He's the prime minister and probably has better things to do in a global pandemic than spend 12 hours in a car.
6) It wasn't an airliner, it was a private jet.

Apart from that, everything you say is spot on.

7) But a boat would have been good...

Charter trains?

…options:
1. 10 Downing street to RAF Northolt -50min+RAF Northolt to Newquay Airport with embarking and disembarking- 1h 50 min+car Newquay Airport to Carbis Bay-50min, total 3h30min
2. 10 Downing street to Paddington-15min+ direct train to Penzance-5 Hours+car to Carbis Bay- 15min, total 5h30min
3. 10 Downing street to Carbis Bay by Tesla's-4h50min without blue strobe, with strobe probably 4h30…
…then a difference of an hour between civilized and a bully...

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Im trying to imagine Boris and all his aides on the rickety old single track St Erth to Carbis Bay branch line.

Ursula VDL just arrived by private jet - just saying!

Biden, in his 747-200 first stopped at RAF Mildenhall in Suffolk (MHZ), mainly used by USAF, to make a speech to the troops, before continuing the 272 miles to NQY.

5 USAF C-17s also involved in Biden visit. Plus helicopters. Plus press transport.

I am not sure a military flight costs less than renting a civil common plane. Ryanair was renting a Boeing 737 for 5000€ per hour of movement, all inclusive, for 60 "business seats".

When was cost mentioned?

Boris' flight was a civil airliner. Not Military.

Always a good idea to put as many people of a government (or company) on one plane together.

Miracles do happen

Exactly. The poster was proposing Boris going from one RAF point to another RAF point, I presume to catch a military transport plane/charter.
In principle, public stuff costs less than private stuff. But when things are military, the costs per hour are always -always- over the roof.

It was the governments A321 - and could have flown from a military or commercial airfield.

G-XATW is owned by Titan Airways. They do charters, and sub-charters for the RAF.

It flew from Stansted, Titan’s base, to Newquay.

He used to cycle regularly in London when he was mayor on a beat-up old bike, with no helmet. We nearly ran him over once as he weaved across the road in front of us.