Mooncrest , I've an Astrolite [ Racal Acoustics ] headset like yours , but converted to 2 plugs . Came with me off Tridents in Dec. '85 . Still working in back seat of Pa28s doing experience flts when Compton Abbas shut [ temporarily ] in Jan'23 .
Blind P.. concur on Ekco wx radar on Trids , worked very well even with orange screens .
And of course A/P FD on Trids was by Mr Smith's of Glos/Cheltanham , the FD a later version of a ' zero reader .'
Were the longhaul headsets more rigid with a single metal bar across the top of head ?
hope this helps .
rgds condor .