In article ,
"Bob Minchin" writes:
I have a number of chokes removed from working 5 foot fluorescent fittings

So have I ;-) They are D rated.
I bought the fittings with the intention of installing electronic
ballasts into them.

Generally, it's illegal to sell old ones for use any more, as they will
fail to meet the required EU efficiency ratings. Ballasts are rated
A (most efficient) through to D (least efficient). D became illegal to
sell some time ago. I don't know the dates for C and B, but they will
(and may have already) become illegal. A was intended for electronic
ballasts, but some magnetic ballasts now meet A (it is split into
something like A1 and A2, but I don't recall the details).

--
Andrew Gabriel