We stayed 3 nights in May and found Lidalia to be really nice. Spacious gravel pitches (but bring strong steel pegs if you have an awning!). Well kept site. Clean facilities, with nice 'all-in-one' toilet shower and sink. Several good dog walks straight from the site. Friendly and helpful owners. One downside: the Wifi is difficult to log in to and very slow. Mobile network is a good 2G. Newcastleton itself is a nice friendly village. Best pub is the Grapes. No real ale there (or anywhere else nearby) but friendly efficient staff, food a bit better than the usual pub fare (and they do take-aways), also very dog-friendly. Lots to do in the vicinity if you like the outdoors. Kielder is only 20 minutes drive, there are plenty of walking and biking trails on the doorstep.