Transferring money USA to UK.

[v15ben]

Looking to move money from the USA to the UK.
Around 12k GBP from my wife's US bank account to her newly opened UK account. It's a one off transfer rather than a regular thing.
Just wondering what people's experiences and recommendations are in trans-Atlantic transfers?
Looking at all options and it seems a currency broker is better value than direct transfers between banks. Is this accurate?

[v15ben]

Thanks for all the advice folks.
Signed up to Transferwise now.
I presume that the exchange rate is better through TW than it would be through a US credit union?

[v15ben]

Ended up using World First and their service was fantastic.
Money now safely in a UK savings account.