Hello from me in Lanarkshire
To answer the noise/smell question re. the pigs - if you're field isn't tiny they shouldn't smell badly. Pigs do have an 'aroma' about them (not an offensive one though;)), but normally only if they are in small, muddy areas - around third of an acre as a minimum for 2 should mean they are as smell free as possible. The only time your pigs will get really noisy is if you're taking too long to feed them
The only issue I can possibly see would be if the folks in the beer garden had one too many and decided to feed your pigs some 'pub grub' - there's the potential for disease problems with that, but if the beer garden is fenced/walled and you put up some signs saying 'DON'T FEED THE PIGS'
it should be fine.
I would say, for the sake of avoiding problems and showing good manners, to pop in and mention to the landlord before you go ahead and get them - you never know, they might want to go halves on 2 weaners and have a hog roast bonfire party later in the year
Look forward to updates
Karen