CH225650 | How to do a compliance check: information powers: third party notice: partnerships: notice to a partner, whose tax position is not being checked, to check one partner
From HM Revenue & Customs · Compliance Handbook
When you give a notice to a partner, whose tax position is not being checked, to check the tax position of one other partner in their capacity as a partner, then the following rules apply:
Your notice must name the other partner
You do not need to give a copy of your notice to the named partner
You do not need approval from the named partner
The recipient partner’s appeal rights against the notice are as set out in CH23520
If you seek the tribunal’s approval you do not need to give a summary of your reasons to each partner, although you may if you consider it appropriate. You should consider carefully and respond positively to any request by a partner for a summary of reasons, provided that doing so will not jeopardise your check
Guidance about relevant partners is at CH21600.