Why cant you paint flettons?
Stuart is near enough in what he has said. If you read the technical literature on masonry paint of any reputable paint manufacturer they will tell you that it is not advisable to paint fletton commons, and they normally refer to BRE IP22/79. There is also another BS digest, from memory 6150/2006 with regard to painting commons. In a nut shell the Oxford belt of clay from Ampthill/ Bletchley to Peterborough has a high carbon content plus an addition of oil which cause kiss marks when the bricks are fired and for some reason that we do not know the kiss marks reject masonry paint.
IN 1968 LBC merged with Marston and produced 88% of the commons made, Redland Fletton 8% and Whittlesea Brick 4%. In 1971 LBC aquired both Redland and Witllesea. Both the last two companies were shut down in 1974, to the best of our knowledge.
We see no problem with LBC bricks what so ever. In our opinion they are reasonably priced, 70% still go to new housing and 30% to the extension market.
Regards oldun