London stockist of Sapim spokes?

Bicycle Workshop, All Saints Road stock Sapim. Not CX Rays though they'll special order them for you.

Old_Blue_Eddy. Most of the handbuilt wheels used in Paris Roubaix use CX Rays, they're lighter and stronger (failure tested to 3.5 million revolutions) than any other spoke I've come across.

aaand even the strength of the mid range, the Race, is quite superb. build me 2nd set with these coz my first set (shitty rims though) where torn apart+plus popped nipples. my vote for strong as could be spokes.

@multigrooves: i had the phone after them session as well, so this might help:

BRICK LANE BIKES0207 0339053 E2
LONDON BICYCLE REPAIR SHOP020 7928 6898 HATFIELDS
BICYCLE WORKSHOP. LONDON020 7229 4850W11
BIKE AND RUN LTD.0208 8151845EAST FINCHLEY
BIKEFIX020 7405 1218 WC1
BRIXTON CYCLES CO-OP.020 7733 6055SW9
CONDOR CYCLES LTD020 7269 6820LONDON WC1
DE VER CYCLES.020 8679 6197STREATHAM
E. CHAMBERLAINE & SON LTD.020 7485 3983KENTISH TOWN
EDWARDES CAMBERWELL LTD.020 7703 3676SE5
FIXED GEAR020 73777522E1
LONDON FIELDS CYCLES020 8525 0077E8
MOSQUITO BIKES LTD.020 7226 8765N1
PROLOGUE020 8878 6266SW14

i got mine from condor, no nipples though, not even blank ones < not that i'd ever build blank nipples on ninja_black spokes, mate! not in that lifetime i'm not!