Cresties and resevoirs

Hi all,

I was just wondering what peoples thoughts were on the likelyhood of cresties using large resevoirs. Ive never been asked to look at a resevoir for them before and having looked at other ones most are pritty sparsely vegetated at the edges, and probably not suitable. The one in question has some suitable egg laying material in very sporadic small patches and does have toads spawning there, but has a deep shelf in it and becomes deep and open very fast.

Also reptiles (i know wrong area) on uplands, not heathy uplands but short sheep grazed and juncusy ones. Would reptiles be likely to still be inactive in these more inhospitable areas or just unlikely to be there at all. The habitat i would have said is sub optimal at best and the wind up there means nothing stays warm very long (tins signs wood etc)

Any thoughts appreciated.

Many thanks