If students sign now for a tenancy starting next June/July (2026), can they give notice to cancel before it starts?

Once the tenancy commences (or from 1st May 2026, whichever is later), tenants will have the statutory right to give 2 months' notice to end the tenancy. Before the tenancy starts, the signed contract is generally binding, but you should seek legal advice on whether 'pre-tenancy' cancellations are affected by the new rules.