There is a Coates CD in the EMI Great Conductors series.  It includes
magnificent Tristan excepts with Leider and Melcior.  There are legendary
pre 1930 Wagner recordings too.  I heard the Gotterdammerung Prologue
which should not be played near flammable material.  Almost too fast.
The whole series of the HMV Potted Ring should be transferred to Naxos
asap.

David harbin
Nottingham, UK