I'm thwarted by the university website being down, as I intended to give a summary of the availability of J M-R's works, but the trade bibliography I would use is down So here's a temporary stab at it, based on Amazon and a few other things:
Collected Memoirs Black Spring Press 2004 0948238305
Selected Stories Dewi Lewis 2005 1904587178
Of Love and Hunger Penguin 2004 0141187115
And the biography:
Willetts, Paul Fear and Loathing in Fitzrovia: The Strange Lives of Julian Maclaren-Ross Dewi Lewis 2003 1899235698