to one of the intermediate trailers. Many of the 4BEP fleet were converted to standard units, since the requirement for buffet cars had declined. The first refurbished unit was no. 7153, which was later renumbered to 1500. This unit was experimentally refurbished in 1975 at Eastleigh Works. Following evaluation, the contract for the refurbishment of the rest of the fleet was awarded to BR's Swindon Works. At the same time, units were renumbered from their original sequence into the later BR standard system reflecting TOPS class and sub-class, though in Southern Region style, only the last four digits were carried - so for example 411 501 was abbreviated to 1501. Units were renumbered in order of refurbishment, not reflecting their original numerical order. Subsequent refurbished standard units were renumbered in the range 1501–1621, and reclassified as Class 411/5. Only seven 4 BEP units were retained and refurbished, being renumbered in the range 2301–2307, and reclassified as Class 412/3. The remaining 4BEP units were converted into 4CEP units by replacing the buffet car with a standard trailer converted from conventional locomotive-hauled coaching stock. Refurbished buffet cars had a small dining room, while a second class room, seating 24, took the place of the buffet. 4 TEP units Between 1983 and 1986, several 4 Big units required extensive refurbishment. To cover their workings, four temporary 4 TEP units were created, formed of three carriages from a refurbished CEP unit, with an unrefurbished buffet car from a BEP unit. The units were renumbered in the range 2701–2704. They were based at Brighton depot and operated mostly on the London to line. The units were disbanded by 1986, once the refurbishment programme was complete, and were reformed as standard 4 CEP units. The unrefurbished buffet carriages were scrapped. Unit formation are given below: Final operations After rail privatisation in the mid-1990s, the different divisions of British Rail were divided up into different franchises. The three former SR division; South-Eastern, South Central and South-Western; all operated 4 CEP units, and are dealt with separately here. Connex South Central The South Central (SC) division, operated as Connex South Central, briefly operated 4 CEP units in the period 1995–1998. Three standard units were converted to Class 411/6 by fitting them with high-speed Mk.6 motor bogies. These units were renumbered into the series 1697–1699. They were chiefly employed on London Bridge to Brighton express services. However, as the