Hi Goldie,
Lydden and Temple Ewell Nature reserve is where you're after:
http://www.kentwildlifetrust.org.uk/res ... r-reserve/
It's got Adonis Blues. I wouldn't say masses, but they are there. The place has thousands of Chalkhill Blues plus Common Blues, Brown Argus, Marbled Whites, Silver Spotted Skipper, etc. in July/August/September. One of my favourite places when I was in Kent. Get there at sunrise and they will be at your mercy with a camera
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I'd think August would be a much better bet for the Adonis Blues.
The place had loads of Wasp Spiders too which I quite liked, though numbers seemd to vary quite a bit from year to year.
I can give you more info if required such as where I've seen certain things etc. There's quite a lot of up and down, but it's well worth it.
Another spot I have seen good numbers of Adonis Blues, and not much else but Adonis, is at a place near Crundale, just north of Wye. I wouldn't say it was one of my favourite locations, but there were plenty of Adonis Blues the time I visited there a couple of years ago.