How to Automate tax rate to 0 for legal entities within the same VAT group

Summary:

We have a requirement for a customer in UK there is a scenario where a number of legal entities share the same tax registration number. How shall we automate the rule that the no tax is applied (or 0 rated tax is applied) to intercompany transactions within the same tax registration group? and standard 20% Tax should be applicable for transaction between VAT group LE and Non-VAT group LE (all the LE's share same ledger)

VAT group LE Vs VAT Group LE : 0 Tax

Not VAT Group LE Vs VAT Group LE : 20 % Tax

Not VAT Group LE Vs Non VAT Group LE : 20 % Tax