Found some info on her Derek:

1996 ANGLIAN MAN, 1999 GRAY TEST

(Damen Stan Tug 1906)
Registered:(GBR)ON 728663
121 GT (55 GRT), L19,5m, B6,0m, D2,7m (64'x20'x9')
2 scr 3-bl., 2x diesel Caterpillar type 3412TA, 671bhp-500kW @1800rpm (1342bhp total), sp 10,9kn, bp 7,5t

ANGLIAN MAN
1996: Casco built by ?? (POL)
1996: Completed by "Damen Shipyards" (NLD) (YN 6116)
1996 -xx/02: delivered to "KTL - Klyne Tugs (Lowestoft) Ltd" at Lowestoft (GBR)
1999: To "Felixarc Dock & Railway Ltd" at Felixtowe
2000: renamed GRAY TEST
2004: still in service

(sistership in the UK is FURNESS ABBEY)

GRAY-TEST :ZQHP4/728663; 55grt;19.50 x 6.04 x 2.80; 2s: 2 x 12 cyl Caterpillar 3412 TA, 1342 bhp/1800 rpm, sbp 17.5 tonnes; fixed propeller nozzles. Damen StanTug 1906 design, built 1996 by Scheepswerf K Damen B V, Gorichem (6116); Hull: Stocznia Tczew Sp z o o, Tczew, Poland.

Completed 2.1996 as ANGLIAN MAN for Klyne Tugs Ltd, Kingstown; arrived 23.2.1996 at Lowestoft; service in Nigeria, then at Ramsgate from 3.1998.
Chartered 1.1999, then purchased 5.1999 by Felixarc Marine Ltd, Felixstowe, renamed GRAY-TEST.

good luck by sorting this out!
rgds Stan

Another nice action shot, looks a bit rough Derek.

Regards
Ken