This extraordinary harvestman, with forked pedipalps, is Dicranopalpus ramosus. It is currently living behind the door of our garage, still alive and apparently still active in the depths of winter.
This species is native to Morocco and was first noted in Britain , in Bournemouth on the south coast, in 1957. Since then it has reached the Scottish border and is still heading north.
This is only the second time I've seen it here in Durham. The first was in summer, when I found one in my greenhouse.
It's a real surprise to find this one in mid-winter, alive but missing a couple of legs.