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Yes apologies the MCB for garage supply trips. The mini CU MCB for sockets ,simultaneously trips.

No changes to circuit & everything has been unplugged including electric doors.

It is wired back to another CU in my workshop integral with the house which it trips as well as the mini CU in the garage.

Thank you ericmark for your helpful reply, I will endeavour to do as you ask :- my outside garage has no power & the CU trips each time attempts are made to switch on. The CU ring main cores securing screws have been tightened too much for me to release them without damaging them beyond further...

Every time I try to switch ring main on it trips off at CU

Unable to use CU to check for tracing garage ring main trip problem, is there an alternative method please? I am semi experienced amateur. CU connection screws immovable.