Colour-ringed Dunlin at Llanrhystud

Chris, the colour-ringed Dunlin you saw will almost certainly be one of the 1,200+ that the Mid Wales Ringing Group  https://midwalesringers.blogspot.co.uk have colour-ringed in the county this year. It was probably ringed where you saw it or at Ynyslas but if you wish to post the details I will let you know for definite.