Many thanks to this forum's Tiermat who not only sold me this lovely little steel-framed bike for my Daughter, but kindly delivered it to my colleague in York before it's long journey down to the West Country, much appreciated.
After a little work, it now looks like this and is the absolute pride and joy of my little 6 year old girl who will be using it for her under-8 racing next season:
Frame: Halfords Lugged Steel, 40.5cm seattube, unknown age
Headset: Original 1" with unusual crown-race diameter (!)
Stem: Raleigh NOS Alloy 40mm
Handlebar: CroMo 30cm
Bar Tape: Deda girly pink!
Brake Levers/Brifters: Tektro RL320 Junior brake levers
Brake Calipers: Al-Honga dual pivot 75mm Extra-long reach
Brake Pads: Generic
Brake Cables: Stainless
Cassette: 18T Freewheel
Chain: KMC 3/8"
Cranks: 125mm (shortened) Shimano Altus 5-bolt 110BCD
Chainrings: Sinz 41T
Bottom Bracket: Shimano 107mm
Pedals: 9/16" junior
Rims: Alienation BMX Ankle-Biter 32 hole black 451 20″ x 1 3/8"
Hubs: System Ex 32-hole black track hubs (100mm/120mm) fix/free
Spokes: Stainless plain-gauge
Tyres: Schwalbe Stelvio 28-451 20″x1 1/8″ HS350 wired
Tubes: 451 Presta
Saddle: Selle Sam Remo Junior
Seatpost: Strurmey Archer Cromo
Seatpost Binder: Allen-key type