Dear Sir/ Madam,
RE: The wedding of [your names] on [date of wedding]
On the [date of booking] we booked your venue for our [wedding/ reception] which was held on [date of wedding].
We paid [in full/ a deposit] of [£xx].
On the [date the venue cancelled] you cancelled our [wedding/ reception].
This meant we had to find a new venue at short notice at an additional cost of [£xx].
Under the Consumer Rights Act 2015, you are in breach of contract and we therefore request a refund of [£xx] plus additional expenses of [£xx] within the next seven days.
Failure to do this will result in further action being taken.