Thats exactly what you are doing though, without any knowledge of the case against her, other than media reports, you ve made a judgement that she has evaded tax, based on what exactly?
& where HMRC is not investigating her this, yet you appear to know more than the tax authorities.
Now, i happen to be on the Left/Labour side of the argument but have consistently said that if she has done anything wrong including tax evasion, she should resign, long before AR said this too.
If you read the threads on this subject, many left leaning MN ers have said similar too.
Yes not living with your spouse is unusual, but its not rare, there is even a name given to it, FB groups, books and articles written on the subject.
Atm, i don't know what AR has or has not done, just that there is no evidence of wrongdoing, should that change, my opinion of her will change too but i suspect that if GMP find she is innocent, you will still claim she is guilty, just "got away with it"