I have an 'Auto Tool Zero' macro which sets the Z position using a touch plate to a height above the plate. This is 10mm above the gage block height specified on the offsets screen. The touch plate is just a brass block bonded to some acrylic sheet and machined flat. I then measured the thickness and this is the gage block height. The brass part is connected to the touch probe input and the tool is earthed (mine earths through the machine). So you put the block under the tool, click auto tool zero and it sets the tool height. The 'Ref All Home' has a macro which moves X and Y to the home switches.

If I can find out how to attach the files I will do. Otherwise you can PM me. I only live up the road from you (In Nottinghamshire)