L5 and T5's were available as the 5 spd versions of the L and T types.

Pre 2004 models were offered in red, green or black except for the C-type which was only offered in red.

Today, with such a larger range of models, the C-type remains red and black is the standard colour for all the other standard models with silver extremities for the M and P-types.

In comparison to today's, the C-type relates directly to the C3E. The L3 is now the M3L and the T6 is closest to the M6R-plus. There are no standard model equivalents for the L6 or T3, however they can be ordered from the ALC menu. The L6 would be an M6L and T3 an M3R with dynamo lighting.
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Major changes along the way for Brompton were:

Late 1992 - New chain tensioner and rear rack were introduced.
Apr 1993 - Headset changed from 1" to 1-1/8"
Oct 1995 - New Cromoly forks were introduced.
Mar 2000 - Mk3 models released. The C-type was introduced and the L and T-types were upgraded with rear mudflaps, stainless steel fittings and screws on mudguards as well as stainless spokes. The left hand folding pedals became standard and new brakes and HP pump. New lights for the T-type and optional, incorporated lights for the C and L types.
Jun 2003 - re-designed, lighter front carrier system introduced.
Jan 2004 - New hinge design and longer wheel base.