Craig
My experience is that most UK courses now have fairly complete irrigation systems. Many were put in in the mid-90's when the UK governemnt gave a windfall VAT rebate to private clubs. We did it at the club I was Finance convenor for and it cost less that $100,000. While some clubs ovrewatered early on, most have learned how to use the systems--i.e. to manage fastness and firmness within the context of keeping the grass alive and the fairways uncompacted, which can very easily happen in mini-drought seasons.