The birds that Bob & Annie saw at Angle are almost certainly from the Gann. They have an orange ring on one tibia, and a black ring with a white 2 digit combination on the other - this is the bit you need to record (I think the numbers go up to 37 so far). If the combination is different, then it will be from a different location. Picture below shows number 15 from the Gann back in January (there are currently at least 6 colour ringed birds at the Gann).
