Which school or university will you be teaching? So far most European teachers here are enjoying themselves. Considering your single, the salary you mentioned is enough for you. Some few that i have meet have bad experiences and decided to left back home even they are well paid. You need to be here and figure it out by yourself. Take a chance you got nothing to loss. One thing you have to be patient enough if you start driving around doha city (lol). Its not about traffic rather reckless drivers are evident.

Basically here its like a collision of different cultures. Im Asian but im exposed meeting with european people here than arabics coz its easy to communicate but somehow i learned to speak arabic as well. Its not difficult for you here im sure considering your holding a british passport its primarily higher status.  One more thing, there is an exclusive clubs for "english people here" just in case your home sick (lol).

2 of my good friends here are teachers and enjoying a good life so far.

If ever you make a choice, make it Life.

if you want more infos hit me up. 

i guess its a good i dea if your not earning well in London. Its an adventure to be here.

cheers mate!!!!!!!