Drive surgeon.
"was asked to seal some limestone flags today, made by brockstone or summat? anyone done this, i can use my sealer on them as its for block paving only."
NO Way!!!!
BDCS
"so what are they ? they are concrete surely ?"
Please tell me you know the difference between Concrete & Limestone?
Anyway rant over, Drive Surgeon here is a web-ste that does a limestone sealer, You most problerbly want The MN Stainstop. I have used it on granite, it is not cheap so price it right, but it is very easy to use.
www.lithofin.deBut I would not even think about sealing at this time of the year, to damp & to cold.