Best bank account to use for sending money abroad

Without freetrade (Hence my interest upon learning about it) I am looking to fund a US broker account which requires sending from a bank account in my name (UK)

Obviously sending fees from a traditional online bank to an international bank incurs significant FX cost

What solutions are there to this. I am under the impression and presume in this instance revolut/transferwise are not allowed as they are deemed ‘3rd party solutions’

Monzo [uses transferwise]
Revolut [not allowed?]
Starling [awaiting on approval, but im thinking this is my saviour option]
Any others?/solutions

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Transferwise Borderless Account?

Does anyone know what is FX rate on IB? Is it 0.5% or interbank?