It might be time for a short note on engine ID here, I have seen the BS649 prefix used more than once in the hope of identifying an engine. BS649, or more properly B. S. 649 : (1958), signifies that the engine meets British Standard 649 set by the British Standards Institute. I believe it was superceded in 1991 by an EN standard.
Re: The performance of reciprocating compression-ignition (diesel) engines, utilizing liquid fuel only, for general purposes.
The standard may be found at times on EEBBAAYY ( I hate to advertise for them). It may also be purchased direct from the Institute.
This is like saying that some widget meets ISO9000 standards. I have seen the BS649 label on an HR2, HR3, ST1, ST2, ST3, and so on.
Potter - In one place you reference a LT1, and then a TS1. If I were in your shoes I would find the appropriate manual and check the timing. It sounds as though it is seriously out of time.
As to rotation, my ST has a key that allows for cranking in either direction, it has a number of US8740 ST2A30-12. Near as I can tell the A stands for anti-clockwise, as that is the direction it rotates when power is applied to the starter.