As far as I understand the terms of separation are a negotiation in itself. It wouldn't make much sense to weaken their position in that process by making it less consequential for the UK.
Plus the UK has used the 'take our ball and go home' bargaining chip so many times, I am not surprised it's falling on deaf ears particularly this time.
Plus the UK has used the 'take our ball and go home' bargaining chip so many times, I am not surprised it's falling on deaf ears particularly this time.