During a very nice weekend I had a chance for a thorough check of Nicholaston to Overton Mere for Colletes hederae and this is what I found.
On sunday I found 2 more colonies, one very large with at least 50 holes, many males patrolling and females entering holes with pollen loads on 45 degree sand slopes in Nicholaston dunes with very sparse vegetation and lots of bare sand. All colonies faced between south and south-west. They were feeding on Ivy at the edge of the woods, sometimes even well into the shade. The species looks well settled in to Gower. Obviously the places to look have Ivy and a sandy substrate, waterlogging free, into which to burrow.