I have a sheet which has to remain unprotected.

Column A on this sheet is made up of the numbers 1, 2 and 3 (on their own).

A
1 1
2 1
3 1
4 1
5 2
6 2
7 2
8 3

What I need to do is prevent users changing any of these values, the sheet
cannot be protected.

Any suggestions gratefully received.

Gareth