14 across (8) --G-N-L- chap in high class railway having expedition.
20 across (8)(5) --F-W--- H-U-E computer company yielding venue for raves.
13 down (10) ---L---I-- book trade has short blip in advertising.
26 across (4) --L- beat back game.
Many thanks, dannyk13, sandyRoe and tyrepill. One of these days I shall solve the DT cryptic crossword without having to call upon your much appreciated help!