McCloud Pension Judgement - Affect of back pay on Adjusted Net Income (eg Child Benefit)

Hello I am a member of a public pension scheme and I am affected by the McCloud Judgement. As such I am due back pay of my pension which will be delivered as a lump sum plus interest minus my tax rate (40% in my case). How is this income treated for the purposes of Adjusted Net Income which is used in the eligibility for The High Income Child Benefit Tax Charge and for the abatement of the personal allowance for incomes about £100,000? The back pay is for the last 5 years but is all coming in one go in this tax year.

Hi George,
For assistance please contact the helpline for Public Service Pensions Remedy (McCloud):
0300 123 1079 option 1,
Open 9.00am to 5.00pm Monday to Friday
Thank you.

Thank you but they specifically cannot talk about the tax implications of the McCloud judgement. Is there a better contact?

Hi George,
You can conatct our Self Assessment helpline:
Self Assessment: general enquiries
Thank you,