Start a company!
have a look at the self employed option and start a small business - eg: you and spouce. It is possible to just pay company tax and your better half can draw a salary at reduced tax rate if they are on lower rate. there are National Insurance issues but not too difficult with a decent accountant. you you choose to go Ltd and VAT registered there are further gains but more regular paperwork.
Lots of UK jet captains work this way rather than PAYE.