OK, I just want to state, I in no way like or condone Rishi Sunak.
Op, I think you may have misunderstood the issue. Very simply there are 3 ways in which you can pay less tax:
1. UK Tax Laws schemes and reliefs.
Legal.
There are loads of things you can do to reduce the amount of tax you pay. These are purposefully introduced to help lower tax.
The most obvious one I can think off is ISA savings accounts. Usually if you are saving money and making lots of interest, you pay tax on the interst you make.
If you open an ISA, you won't pay tax on the interest. Very legal, in fact encouraged.
2. Tax Avoidance
Semi legal ish.
Very simply, you find a loophole in the Tax Law and take advantage of it to reduce your tax.
Think Amazon, Starbucks etc.
Some Tax Avoidance schemes have been allowed, then it's up to the Governent to tighten the loopholes.
Is it illegal? Most of the time, No
Is it morally wrong? Yes
3. Tax Evasion
Highly illegal. In fact fraud. You are purposely hiding your money from HMRC, so you dont pay tax.
Rushi, well his wife, falls under No. 1 - perfectly legal Tax Scheme and morally fine to do.
You may not like it which is fine, but they have done nothing wrong.
My explanation above is a very brief overview , there is much more to it than this, but I don't think anyone will appreciate pages and pages of Tax Law. 😁