Hello,
We have made our own so we don't have to buy them for expensive money.
As long as the tests are logged, it doesn't matter how the actual book looks.
If you can, just print a label and put on them so it is easy to see which one is for what.
An autoclave log book I guess you must have used long before HTM 0105, as that has been a necessity for many years, so you'll know how to use that.
It is always difficult before you "get the hang" of things.