Fleecewife is right - fencing is ongoing, and contractors frequently let you down, and aren't available for that important repair.
It is actually quite easy to do yourself, and you can hire in the kit to get it right.
First I would suggest you invest in a book on fencing
The following page lists several that all look quite useful (am not recommending any as I have not read them)
http://www.amazon.co.uk/Guide-Stock-Fencing-Andy-Radford/dp/1861265417To put in a gate you will need hanging post, catch post & gate (obvious really, but always assume no knowledge)
Easiest is to get all three as metal, and with hanging post "hangers" already on. Buy all three from the same place as the space between hinges varies with every manufacturer.
McVeigh Parker are good in you/our area
http://www.mcveighparker.com/mcvp_store/index.php?_a=viewCat&catId=88http://www.mcveighparker.com/mcvp_store/index.php?_a=viewProd&productId=298I would go for a gate with a D shutting and auto catch post, easier than a spring loaded and slot.
Hire a post hole boarer
eg
http://www.aplant.com/catalogue.aspx?id1=111015Just make sure you have two strong people, and drill vertically - old rule applies measure twice cut once, - honestly it is dead easy, and hinges adjust for small errors !
Insert posts, add postcrete (from any good diy) leave 48 hours, hang gate, job done!
To fence, consult the book !
oh and when you need your pigs, let us know !!