Cliff's the expert and has the fish-finding skills, but as a total tourist who's made just 4 trips to the wye in the last 3 years (total 14 days fishing), 10 out of my 14 fish have come in the 2 hours after dark, one more at the start of dusk, 2 in the morning and one at lunchtime. None at all between 2 - 6 pm in 14 days of fishing mostly with 2 rods.. (I fish two rods only when it's clear that bites will be few and far between )
I know it's all about finding the fish in the day time, but basically I have no idea how to find them - even when someone like Woody (or a helpful p-m off here) marks 'x' on the map, I have had very little day time success and so yes, just after dark they do seem to come and find the bait a bit more, as is my experience on most rivers i fish up here in Yorks too.
I don't enjoy fishing after midnight but from dark till 11pm in late summer or autumn, yes please, so in other words yes Cary, i feel the same as you and get frustrated if i can't fish too long into dusk.
Join Hereford for £50 a year would be my advice. It more than pays for itself versus day tickets in one single long weekend trip if you take a guest (4x2 peoplexday tickets = £80 with no night fishing, 1 x Hereford book+guest@ £4/day for same 4 days = £66 with night fishing plus free access for a year = no brainer) . There are hundreds of swims where you can make sure in advance that steepness & depth in front of you are not issues of concern.
Oh and stan at Aramstone seemed to have a relaxed attitude towards finish time there. i think rules said off at dark but he said it's be Ok if we were away by like 10pm on a night when I think dark was about 8.15. I think he trusted us cos we seemed like a fairly harmless and clueless sort of couple who weren't going start barbecueing everything that moved - mm tasty lamb & salmon- as soon as he went off for the night). The only fish we had there were around 9pm so that was good.