SIR - ‘May's ultimatum’ shout the headlines. Accept the 'Chequers deal' or...or what ? Given that our Prime Minister told us that we would be leaving - without condition - the Single Market and Customs Union and taking back control of our borders, laws and money she has nothing much left to use as a credible threat.

The only threat with any chance of success and which will be remembered by your readers with very long memories would be the one used regularly by Violet Elizabeth Bott. In the dim and distant past she featured in Just William radio and television comedies about a schoolboy called William Brown.

William had a ‘thing’ about Violet Elizabeth who, whenever she didn't get her own way, would threaten to ‘scream and scream until I’m sick’. It always worked with William. I doubt it would with Michel Barnier, but it's worth a try.

Brian Holmans, Langley Road, Bingley