Geordie, Normally inlay work is done with a small diameter guide bushing that has a special collar that attaches with an allen screw. Here is one brass kit from Woodcraft:
http://www.woodcraft.com/family.aspx?FamilyID=1391 I do not recommend the kit Rockler sells as it has a steel bushing, nut and brass collar.
I am guessing TemplateTom will know what is available in your part of the world and the best place to order from.