My code is 1097L-M1 does this mean I’m on emergency tax for some reason?
Yes the M1 denotes an emergency tax code; see here https://www.gov.uk/tax-codes/emergency-tax-codes
You will need to call HMRC to find out why and change the code if it is wrong. This page gives you some more information: https://www.gov.uk/tax-codes/updating-tax-code
Advice given is for illustration purposes only and should not be relied upon for your tax planning or tax affairs. We recommend that you seek the advice of a suitably qualified accountant before making any tax planning decisions.