Engraving Machine to engrave around 0.3mm depth, DXF files on aluminium, anyone?

I'm in London looking for a machine to engrave our aluminium faceplates, the engraving needs to be about 0.3mm deep and is from a DXF file, the units are 110mm x 110mm. Looking around I think a Roland or Gravograph might do the job? but I'm sure you will know better than me what I could use/ should use? Any suggestions welcome.
See pic for roughly what we need to do, the letters are about 8mm high.

If you have a suitable "pre loved" unit let me know :-)

Regards

Stuart

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