Tiree weather for the day, pilot was IMC qualified and I'd expect with the forecast en route he would have planned to use it:
SA 04/04/2015 18:50-> METAR EGPU 041850Z AUTO 27005KT 4800 BR BKN003/// OVC010/// 07/07 Q1026=
SA 04/04/2015 18:20-> METAR EGPU 041820Z AUTO 29005KT 250V310 9999 BKN003/// BKN009/// 08/07 Q1026=
SA 04/04/2015 17:50-> METAR EGPU 041750Z AUTO 30007KT 9999 BKN003/// 08/07 Q1026=
SA 04/04/2015 17:20-> METAR EGPU 041720Z AUTO 29006KT 5000 BR OVC004/// 08/08 Q1025=
SA 04/04/2015 16:50-> METAR EGPU 041650Z AUTO 30008KT 9999 OVC007/// 09/08 Q1025=
SA 04/04/2015 16:20-> METAR EGPU 041620Z AUTO 31009KT 280V340 9999 BKN007/// 09/08 Q1025=
SA 04/04/2015 15:50-> METAR EGPU 041550Z AUTO 30009KT 250V320 9999 OVC006/// 09/08 Q1025=
SA 04/04/2015 15:20-> METAR EGPU 041520Z AUTO 30009KT 9999 BKN009/// SCT015/// 10/09 Q1025=
SA 04/04/2015 14:50-> METAR EGPU 041450Z NIL=
SA 04/04/2015 14:20-> METAR EGPU 041420Z AUTO 31010KT 9999 SCT005/// BKN014/// 10/09 Q1025=
SA 04/04/2015 13:50-> METAR EGPU 041350Z AUTO 31010KT 9999 SCT005/// SCT015/// BKN024/// 10/09 Q1025=
SA 04/04/2015 13:20-> METAR EGPU 041320Z 30012KT 9000 SCT002 BKN005 10/09 Q1025=
SA 04/04/2015 12:50-> METAR EGPU 041250Z 30010KT 9999 6000NW SCT002 BKN004 BKN014 10/09 Q1025=
SA 04/04/2015 12:20-> METAR EGPU 041220Z 29013KT 9999 SCT002 SCT004 BKN016 10/09 Q1025=
SA 04/04/2015 11:50-> METAR EGPU 041150Z 30014KT 260V320 9999 FEW002 BKN005 BKN030 10/09 Q1025=
SA 04/04/2015 11:20-> METAR EGPU 041120Z AUTO 30012KT 9999 BKN002/// BKN018/// 09/09 Q1025=
SA 04/04/2015 10:50-> METAR EGPU 041050Z AUTO 30010KT 7000 BKN002/// BKN018/// 09/09 Q1025=
SA 04/04/2015 10:20-> METAR EGPU 041020Z AUTO 31013KT 9999 OVC002/// 08/08 Q1025=
SA 04/04/2015 09:50-> METAR EGPU 040950Z AUTO 30012KT 3800 BR OVC002/// 09/08 Q1025=
SA 04/04/2015 09:20-> METAR EGPU 040920Z AUTO 30011KT 2300 BR BKN002/// 09/09 Q1025=
I departed Perth a couple of hours earlier that day and the cloud base in that area was around 4000' though reducing significantly inland, forecast to the west was guff, freezing level if I recall given as 2-4k. I was headed south thankfully but even that was rubbish south of Edinburgh and I had to route along the coast.
Regards
UA