Hi njc23,
Thank you for your additional question.
Entitlement to UK personal allowances is not strictly proper to this forum but I can confirm that as a UK citizen you are entitled to claim these and should tick Q 16 on SA109...
Please see
Residence, remittance basis etc notes .
Your wife does not qualify for UK personal allowances as they are available only where the individual is both a national and a resident of the terrority (UK).
Whilst she is resident in the UK she is not a UK national and she does not therefore satisfy the criteria for claiming these.
Thank you.