The format of the number is two letters, six digits, and one further letter or a space.

A further letter of concern is addressed to Friends schools and colleges.

Philip had received no further letters from his wife since the last one in the summertime.

Well we may need a, a, a further letter now.

It is possible that a further letter was sent to the successor of the late Negus.

There were no further letters to any of them.

There was a further letter eight days later.

There are no further letters until the end of April, by which time the situation had improved.

This week's extension of the suspension has lead to a further letter to unit trust holders.

There was no further letter or news of any kind.