We arrived and there it was! There was still a bit of debate as to whether it was a Collared or Oriental, but soon everyone was certain it was an adult Collared Pratincole. After giving some great views on the ground it flew off north-west and out of sight.
About fifteen minutes later it returned and flew around, providing us with some superb flight views and photo opportunities. It even called briefly at one point.
Other birds at Castle Island included a Little Egret, 7 Black-tailed Godwits and at least one Common Sandpiper.