I first bought Celtic Rennaissance, which I loved, and wanted more - but the shops i asked in did not know of any others by the same musician. Finally i stumbled across a copy of this, 'Celtic Journey', in a garden centre. Don't be put off by that though - this is absolutely fantastic music. I've heard some dreadful rubbish put out under the heading of 'celtic music', but this is nothing like that - it's streets ahead of anything else I have heard. The melodies are subtle and memorable, the playing is superb, and the way that natural sounds are woven into the mix is extremely effective. I have literally hundreds of CDs across many musical styles in my collection, but this one (together with Celtic Renaissance) is way up there in my top 10 albums of all time.
(By the way, I have just been delighted to discover that Mark Britten has a third album, 'Celtic Spirit', which I have just seen listed here on Amazon - I'm about to order that too - do the same as me - this is really great stuff!