Thanks for the replies, both of you. I opted to receive notifications of replies but I didn't get any, so it's a good job I looked.
I hadn't considered bussing from Porthmadog, that's a good suggestion but as I was thinking of spending my first night camping at Beddgelert, on Cae Du site, it would be a bit pointless.
I'm not bothered about anyone parking an inch from my bumper, that's what it's like at home, lol, and my 12 years old car is covered in marks just from being in Tescos car park for 45 minutes each Friday!
Where I had in mind in Beddgelert was in the area just north of the road junction, with the river and pavement one side and the Post Office etc, on the other side of the road. Just hoping it doesn't have yellow lines now.