My tupenn'orth.
I concur with
avjones that the OP is unlikely to have acquired domicile in Kuwait. Domicile is a complicated field that looks at not only where you reside but also where you intend to reside.
While I am no expert on immigration laws in the Gulf states, from a cursory glance, they do not appear to make any provision for settling there on a permanent basis. You are only good enough to stay there while you are capable of working there. So, I would find it hard to believe that one would have the intent to stay there on a permanent basis and therefore one is incapable of forming a domicile in those states.
When one applies for ILR and certainly when one applies for British citizenship by naturalisation, one creates an expectation that the "center of one's life" is in the UK (language borrowed from the Surinder Singh route to convey the idea) and it could be construed that one has therefore chosen the UK as the domicile of choice at that point in time.
Domicile is a very grey area, as
avjones advised, as it deals with
intent to live permanently and not actual residence. People have purchased burial plots in another country to demonstrate that they intend to live permanently in that area later in their life. That is mainly done for tax purposes.
Further reading:
The official Home Office guidance on domicile. Have a look at the questionnaire at the end to see why the law firms would charge you the sum that they quote.
The difference between Domicile and Residence. This deals primarily with financial domicile, but the concepts are related.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.