Advenza Freight (English Wikipedia)

"First Supplemental Agreement between Network Rail Infrastructure Limited and Advenza Freight Limited relating to the amendment of a track access agreement" (PDF), rail-reg.gov.uk, Office of Rail Regulation, 15 March 2004, archived from the original (PDF) on 9 November 2008, The parties entered into a Track Access Agreement (NonPassenger Services) dated 16 October 2003 in a form approved by the Regulator
Track access decisions library, Office of Rail Regulation, see decisions for "Advenza Freight" 2004-2009
"Application from Advenza Freight Limited under Section 17 of the Railways Act 1993" (PDF), rail-reg.gov.uk, Reasons for the application under section 17 of the Act, 2 October 2003, archived from the original (PDF) on 30 October 2007, Advenza is seeking a level 1, firm freight track access right for a train service each weekday between these two points, to underpin prospective commercial contracts currently being negotiated. Additionally, Advenza is seeking a spot bid right for an additional flow each weekday between Hams Hall and Deanside. To date, Network Rail had only been able to offer spot bid rights, and not firm rights (level 1 or level 2), for the proposed services.
"Approval of a Track Access Agreement between Network Rail Infrastructure Limited and Advenza Freight Limited" (PDF), rail-reg.gov.uk, Office of Rail Regulation, 19 April 2006, archived from the original (PDF) on 13 December 2007

railwayherald.org

"News Desk" (PDF), Railway Herald (126): 7, 11 April 2008^{[permanent dead link‍]}
"Notable Workings" (PDF), Railway Herald (206): 11, 21 December 2009^{[permanent dead link‍]}
"Advenza Freight gains new containerised flow" (PDF), Railway Herald (180): 3, 8 June 2009^{[permanent dead link‍]}
"On the scrap trail!" (PDF), Railway Herald (123): 5, 7 March 2008^{[permanent dead link‍]}
Sources:
- "Notable workings" (PDF), Railway Herald (198): 13, 19 October 2009, Class 66/8 No.66843, the fourth member of the class that never actually worked for Advenza^{[permanent dead link‍]}
- "Notable Workings" (PDF), Railway Herald: 11–12^{[permanent dead link‍]}
- "Return of Gloucester Horton Road" (PDF), Railway Herald (35): 8, 31 March 2006^{[permanent dead link‍]}

Hitchin Branch, Railway Correspondence and Travel Society, Freight Traffic, archived from the original on 23 October 2014, retrieved 7 January 2012, during the Summer of 2009 locomotives of the short lived 'Advenza Freight' company .. worked several stone trains ... 'Advenza Freight' briefly moved scrap metal trains from Hitchin to Sheerness during 2009

Executive Summary Advenza Freight 15 June 2003
"Application from Advenza Freight Limited under Section 17 of the Railways Act 1993" (PDF), rail-reg.gov.uk, Reasons for the application under section 17 of the Act, 2 October 2003, archived from the original (PDF) on 30 October 2007, Advenza is seeking a level 1, firm freight track access right for a train service each weekday between these two points, to underpin prospective commercial contracts currently being negotiated. Additionally, Advenza is seeking a spot bid right for an additional flow each weekday between Hams Hall and Deanside. To date, Network Rail had only been able to offer spot bid rights, and not firm rights (level 1 or level 2), for the proposed services.
"Approval of a Track Access Agreement between Network Rail Infrastructure Limited and Advenza Freight Limited" (PDF), rail-reg.gov.uk, Office of Rail Regulation, 19 April 2006, archived from the original (PDF) on 13 December 2007
Hitchin Branch, Railway Correspondence and Travel Society, Freight Traffic, archived from the original on 23 October 2014, retrieved 7 January 2012, during the Summer of 2009 locomotives of the short lived 'Advenza Freight' company .. worked several stone trains ... 'Advenza Freight' briefly moved scrap metal trains from Hitchin to Sheerness during 2009

"BR Diesel & Electric Locomotive Numbering Data: 60001-70006", wnxx.info, 66001-66957 / Class 66, see entry for "66406" to "66409", The 66/8 sub series was later created to cater for the short lived Advenza Freight use of the type when four ex DRS Class 66s were renumbered into the 66841 to 66844 number range. 66841 to 66844 have since been taken over by other operators