Just returned from the Rui Karamboa, Boa Vista Cape Verde ticks your boxes

Try looking at Thomsons last minute holidays on their website. They had the sofitel at Taba in Egypt for £350 each leaving beginning July.

look ay hays travel after a quick look they have ai holidays in majorca,costa brava, costa del sol, fuerteventura, crete and malta at the beginning of july for under £800 for 2 you need to add the cost of a transfer to the booking but that should be only about another £40 for 2 and it will still be under £ 800.
my son just booked with them a couple of days ago with his girlfriend for majorca in sept and he didn't want to pay more than £800
either, he's going to the sol calas de mallorca resort reviews look good its 3 hotels that are now grouped together.
had a look for that hotel for you but couldn't find it for july.

Thanks guys, I've looked at some of your suggestions but still can't find a suitable holiday, it's the hotels that let them down. We're getting a bit desperate now as it's just a week away