Hmm. Halfords can afford bigger lawyers than I can, so I'll be careful.
The legislation you quote (RVLR) is what you need at night. I think the relevant sales legislation is The Pedal Bicycles (Safety) Regulations 2010 (
http://www.legislation.gov.uk/uksi/2010 ... ion/4/made), which says that bikes sold
assembled need pedal reflectors that comply with RVLR.
You might find, if you read your paperwork with a magnifying glass and through a looking-glass, that the bike was sold to you
unassembled, and that the shop then assembled it for you.
EDIT: I should add that RVLR has a number of amendments. I skimmed through them and could find nothing relating to pedal reflectors, but I might have missed it.