1. Under UK nationality law, you can obtain a British passport after five years living with your UK spouse in the UK. So you are perfectly entitled to apply today for British citizenship. So, it is accordingly, not complicated for you to obtain British citizenship. You already have fulfilled the requirements. However, even though you will apply directly for citizenship, you will need to undergo a Life in the UK test. I regret to say this requirement is necessary for all application obtaining citizenship by marriage. Here is a link to the UK Government website which sets out the requirements for you to undergo https://www.gov.uk/becoming-a-british-citizen/if-your-spouse-is-a-british-citizen. You will also find information and how to apply and the form for your application here as well.
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