Just an additional thought, which may be of interest to you [MENTION=778406]wyddfa[/MENTION]

QR flies DUB-DOH
and
CX flies HKG-DUB
CX commences flying HKG-DUB on 30-Mar-20
So Dublin would work as the start and end point of your RTW

The ex-Ireland RTW base fares are a little cheaper than the ex-UK fares
but the big saving would be the departure taxes for your first trip - to Baku

ex-DUB departure taxes are EUR13 (= ~GBP11)

ex-MAN departure taxes are
- in Economy GBP96
- in any other cabin GBP192