Berin sent me some pictures of this mitre plane he made from spalted boxwood and a fine job he has done too. Shown before being soaked in oil against a rather dramatic spalted beech cabinet.
He was inspired by the plane by Tim Smiths mitre plane http://davidbarronfurniture.blogspot.co.uk/2012/06/tim-smith-mitre-plane.html
and of course Bill Carter http://www.billcarterwoodworkingplanemaker.co.uk/
End grain shavings on some yew seems to work well.
And here he is the man himself, in a well organised and cosy looking workshop. He has a very active and interesting blog which is well worth a look http://www.berinsblog.blogspot.co.uk/