Oh Maggie - we are in Devon too - down by Sidmouth - Hello!!
Our area is already fenced - mainline electric, as our youngest Kune is very big, and to be honest, they haven't gone near the fence since we put it up a year ago. I think temporarily fencing an area for the goats would be a good idea for us, as then they can get used to the pigs. Our Llamas are absolutely petrified of them - think it is something to do with low lying stocky fast moving things (perhaps inbuilt fear of Jaguar's??) who knows?
Anyway, once when Piglocks the big Kune escaped, the Llamas all clubbed together and after their initial fear tried to take him down! So, will be very cautious with the goats, just incase they react in a similar way.