The best possibilities to collect agates in Ayrshire are given at the coast around Dunure. Agates from Ayrshire are mostly intensively coloured. Sometimes pastel-colored agates can be found too.
More informations about scottish agates are given in Dr.H.G. Macpherson´s book “agates” (published by the British Museum (Natural History) and the National Museums of Scotland).
You can find more informations about scottish agates on the following webpages:
Chris Harlows webpage about scottish agates
Nick Crawfords webpage scotsagate
H.Currie Minerals of Scotland