Large letter dimensions royal mail

According to Royal Mail's guidelines, the maximum dimensions for large letters are:

These dimensions apply to all large letters, including those sent within the UK and internationally.

It's worth noting that Royal Mail also has specific rules for large letters that are sent to certain destinations, such as:

If your item exceeds these dimensions, it will be classified as a parcel and will require a parcel service, which may incur additional costs and may have different delivery times.

It's always a good idea to check with Royal Mail or a post office for the most up-to-date information on large letter dimensions and any specific requirements for your item.