Is there such a thing as a 10mm in line service valve. I have looked and found 15mm (and bigger) ones and 10mm ones with handles. Am I missing the obvious. Thanks in anticipation from not a plumber.
You could use a 15mm one and a set of reducers http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=71782&id=23297 BB
take the handle off good idea, then would still need a tool to operate, just a spanner rather than a screwdriver! Why does it matter if has a handle??
The handle only matters because it is in a confined space (width ways) and a screwdriver seemed the easiest option to operate the valve.