Can an agreement to agree unenforceable under English law?

Yes, an agreement to agree is generally unenforceable under English law. An agreement to agree is a contract where the parties have agreed to reach a future agreement, but have not yet agreed on the specific terms. This type of agreement lacks certainty, as the parties have not yet agreed on all the essential elements of the contract. In English law, contracts must have certainty in their terms in order to be enforceable, and an agreement to agree does not meet this requirement.