Call the Midwife

Call the Midwife is a miniseries currently playing on PBS which documents the lives of midwives in East London in the 1950's. It's a fascinating period piece, observing post-WWII tenement poverty, and life and death choices. It also features the most excellent Melinda Hart as one of the midwives. But, I have to ask: Is anyone else watching it for the bikes? The midwives use their bikes to make housecalls, carrying their equipment and supplies on the back, using a headlight to ride in the early morning through the late evening. Sturdy, sensible transportation cycles weren't the alternative -- they were essentially the only solution to getting around in a tight neighborhood where cars were a rarity. And (not to give anything away), a bike becomes a critical piece of equipment in Episode 6. Does anyone know anything about the bicycles they are using in the show?