Arlanda transfer times
I'm arriving at Arlanda Terminal 5 with Qatar Airways and then flying on to Heathrow with BA from Terminal 2. It's 2 separate tickets, but as I'm flying business class and they're both One World airlines I'm assuming I can check my luggage (originally from Bangkok) all the way to London.
There is 1 hour 40 minutes between the flights which I had assumed would be plenty, but I'm unable to find out:
1) Can I transfer entirely airside from Term 5 to Term 2? If so, how?
2) If I can't transfer airside, how long should I expect it to take to get to and go through immigration at terminal 5?
3) I see there are shuttle buses between the terminals, but would it be as quick to walk briskly from one to the other?
4) How long should I expect it to take to check in and get airside at terminal 2?
5) In the unhappy event of a delayed inbound flight so I don't make the connection, how likely is that Qatar would rebook me on the next BA flight?