Here is the Luton weather.
METAR EGGW 100550Z 19004KT 140V230 0100 R26/0275 FG OVC001
03/02 Q1029=
SA 10/12/2013 05:20->
METAR EGGW 100520Z 20005KT 160V230 0100 R26/0325 FG OVC001
03/03 Q1029=
SA 10/12/2013 04:50->
METAR EGGW 100450Z AUTO 19006KT 150V240 0050 R26/0275 FG
OVC001 03/03 Q1029=
SA 10/12/2013 04:20->
METAR EGGW 100420Z 19006KT 150V220 0100 R26/0275 FG OVC001
03/03 Q1029=
SA 10/12/2013 03:50->
METAR EGGW 100350Z 20005KT 0100 R26/0325 FG OVC001 03/03
Q1029=
SA 10/12/2013 03:20->
METAR EGGW 100320Z 19005KT 160V230 0100 R26/0275 FG OVC001
04/03 Q1029=
SA 10/12/2013 02:50->
METAR EGGW 100250Z AUTO 20007KT 0050 R26/0250 FG OVC001 04/03
Q1029=
SA 10/12/2013 02:20->
METAR EGGW 100220Z 20006KT 0150 R26/0450 FG OVC001 04/04
Q1029=
SA 10/12/2013 01:50->
METAR EGGW 100150Z 19006KT 1300 R26/1400 BR SCT002 03/03
Q1029=
SA 10/12/2013 01:20->
METAR EGGW 100120Z 18006KT 1000 R26/P1500 BR SCT001 04/03
Q1029=
I wonder if the decision to commence an approach at EGSS was based on MEt vis and not the RVR.