According to Realtime Trains the route and timings were;
London Kings Cross .........2117....................2116 1/2.......RT
Belle Isle [XKB]....................2119....................2119 1/2.......RT
Holloway South Jn.............2120 1/2............2121.............RT
Finsbury Park [FPK]............2124 1/2............2124 1/2......RT
Ferme Park Recp. [XFD]...2134 1/2/2135..2128/2128..6E