If she actually works then yeah
If she doesnt you are walking a fine line as in any inspections they may find out and tax you !
But just get here to do some office work , or a days cleaning?
There are 2 ways you can use here
1. self empoyed like you , you both have 6-7 k tax allowance and must both put in a tax return , only problem with this is she could be deemed an employee unless everything is seperate
2. go ltd and both are partners/directors
you get the amount below NI threshold each about 10k s year and then pay 20 % corporation tax on company profit and then get about 40 k each in dividends tax free
Something like that would work