It is indeed called Harvieston Fishery run by a chap called Dougie Cullens I believe. Been there a couple of times now both for a quick 2 hour shot and got 2 first time (1 blue, 1 rainbow) both about 2lb mark. Blanked on 2nd trip though. They were taking small black buzzers the first time but must have changed there minds on my next visit! Dougie said he'd put some large browns in around the 5/6/7lb mark. On my first visit I think I hooked into one and it snapped my leader

.
They were going to wait until next year to open but have decided to get up and running early. Still in the process of tidying things up but it a good place and staff are friendly. £13 for 2hrs - 2fish, £17 for 4hrs - 3 fish.
Fair bit of weed in the water due to it being neglected for a few years by the previous owners but I'm sure they'll get it sorted.
Good hard fighting fish and worth a visit. nice and local for me!!
Don't have a phone number for you but it's open 7 days from 8am till dusk.