The new Industrial Locomotives book from the Industrial Railway Society lists an 0-6-0 Hunslet Barclay as being there, number 078 built in 1969 as works number 6663, rebuilt in 1999 as works number 6586.
There is also a four wheel shunter named "Edward" which is owned by Hunslet Ltd and is works number 267V of 1976.
Should be a third locomotive on site, another 0-6-0 numbered 077; that will be works number D1198 of English Electric of 1969 rebuilt as works number L122 by Yorkshire Engine Co in 1993.