Thanks for the info Flood,
I haven't seen any photos of the Mk3 SLE/SLEP's displaying the InterCity branding in black, only the ones I described in my earlier post. Sorry for misleading you with my incorrect information Dan.
I've had a look in my 1987 Ian Allan Spotters book, and have found two photos one by Bill Sharman and the other by Chris Morrision of Mk1 InterCity liveried coaches. Mk1 AA11 FK #13229 displaying InterCity Motorail branding at Stirling 1986 and the other photo, Mk1 AK51 RKB #M1524 displaying InterCity Buffet livery at Stafford 1986. What's interesting about the second photo is, there's part of a Mk3 coach displaying InterCity branding in black.
K9-70