Apparently a small independent label, or possibly a custom recording outfit. Tee-Cee managed at least three releases, all of them in 1978 and all made through SRT. Gaberlunzie's single 'Blue & White For Scotland' b/w 'Land Of MacDonald' (SRTS/CUS-78116) was the first; it was closely followed by 'I Will' b/w 'Secret Love' (SRTS/CUS-78117) by Rygby Darnell. An EP by Kay King featuring 'Stand By Your Man' and three other tracks (SRTS/78/CUS-128) followed shortly afterwards; it had a pale blue label with black printing. Thanks to Nicholas Hough for the scan, and to Stephen Small for bringing the last two Tee-Cees to my attention. I would guess that 'Tee Cee' stands for the initials of the person through whom the records were made - googling doesn't come up with any studios of that name.
Copyright 2013 Robert Lyons.