Contact details for Llanerch Publishers are available through the link I gave above, but it may be worth reproducing the note here:

IMPORTANT NOTE: Llanerch Publishers.... are shortly ceasing production. They are at present negotiating with a possible buyer who would continue with the mail-order list, but anybody wishing to acquire any of their reprints, which also include collections of traditional dance music, folklore, medieval history and so on, would be well advised to do it soon.
Contact details:
Post: Llanerch Publishers, Felinfach, Lampeter, Ceredigion, Wales SA 48 8PJ
Phone & Fax: (01570) 470567
Email: llanerch@talk21.com (Short messages only).
Website: http://www.llanerch-publishers.co.uk

The website contains their full catalogue, which is well worth looking at.

Malcolm