fir and fair pronunciation (BrE)

[jokeofcreation]

Good morning/good afternoon/good evening (depending on your present location...).
(I would appreciate it if you could answer the question below)
How am i "supposed" to say words 'fir' and 'fair' properly (details needed) while uttering them differently? It gonna take a while before I figure it out completely so go ahead if you have any thoughts on this subject...
Sincerely yours
One of many
Ps. I'm sorry if I weren't 'precise' enough. Being 'imprecise' wasn't my purpose, I assure you.

edit: Ok, let's say I figured it out...

 

[konungursvia]

Fir is a monophthong, while fair has a slightly diphthongized character.

 

[Koronas]

However, In Liverpool, England, they pronounce "fair" as "fir" or "fur".

 

[Tdol]

The lips are wider apart when saying fair.