ESA Contribution Based + IR Top up and NHS pension

Your pension will affect any Income related ESA £1 for £1. Any pension under £85 per week won't affect your Contribution based ESA. Were you claiming both premiums on your ESA... Enhanced disability premium and severe disability premium?

Those 2 premiums are what you will lose yes, which is £80.70 as you pension is less than this per week then it will work out that you'll lose approx £60 per week.  I don't know who told you that your pension wouldn't affect your ESA but it does. You will get to keep the contributions part which is approx £110.75 per week, providing your pension is below £85 per week. Unfortunately you won't be able to challenge this decision because that's the rules for Income related benefits. You need to report all changes in circumstances.

Which is what is said £1 for £1. It's the rules for Income Related benefits unfortunately. You can't have the pension and the full Income related top up.