Leonard Rogers says In summer 1963 there was a timetabled relief during July and August to the Thames-Clyde Express (1M86). This MAY have been 1M88. However, a photo from summer 1964 of the Waverley (10.15 Edinburgh - St Pancras) seems to show it as 1M88; in 1967 it had become 1M91 and Further research shows that 1M88 was the up Waverley in summer 1962 as well as in 1964. It seems fairly certain that this was the case in 1963, as here, also .