I’ve had a couple of recent holidays in Gairloch, where I’ve spent a considerable amount of time searching for Northern Emerald, White-faced Darter and Azure Hawker in the surrounding areas. It’s probably fair to say that none of the three species are easy to find at any of the favourite sites mentioned so far:
Slattadale Forest (spelt with an ‘a’ - being pedantic!), Glen Affric, Loch Garten, Bridge of Grudie or Beinn Eighe visitor centre) though it’s worth mentioning that on each occasion I’ve probably been at either end of the peak season (early June or late July/early August). You should stand a much better chance of connecting in early July!
As has been said already, the boardwalk/bog pool on the approach road to Loch Garten RSPB is probably the best bet for Northern Damselfly, but I think if time is limited I’d focus my efforts elsewhere for the others. You could of course be lucky anywhere though!
I’ve managed to see (and photograph well) precisely one each of the other 3 species at Slattadale Forest (map attached) over two visits in late July 2011 (but I’ve failed to see any of the targets on several other visits!). I’ve tried all of the other sites on several occasions, without success (with the exception of Uath Lochans, which definitely sounds worth a try for N Emerald) so for that reason Slattadale would be my favoured site to concentrate my efforts. If you’ve gone all that way to Scotland then another hour and a bit is surely worth the effort to give yourself the best chance! I've read of other trip reports to this site where visitors have seen 10+ AH sitting around on the logs/stumps in peak season.
During my 2011 visit, I bumped into the local dragonfly recorder, who gave me details of perhaps the best site in Scotland for WFD (Monadh Mor, not far west of Inverness as you drive towards Loch Maree) Site/location details in this leaflet:
http://www.british-dragonflies.org.uk/sites/british-dragonflies.org.uk/files/images/Scottish%20leaflet%20-low%20resolution%20website%20version.pdf
He said it’s easily possible to get 20-30+ WFD there in peak season. From my research ‘Simon’s Pond’ is the main water body and best spot to look (apparantly named after a boy who went missing there, so be careful!)
On the day I spoke to the recorder, he’d seen a couple of male Azure Hawkers on the roadside pools about 100-200m before Bridge of Grudie (left hand side as you drive westwards). That’s where adults return to breed/oviposit.
Map of Slattadale attached, as well as a heavily cropped image of a possible Azure Hawker from 8th Aug 2014 (high up in the same Ash tree I saw a male in 2011)