were thinking of upgrading our car now in the next couple of months and strongly considering buying in the North of Ireland, we havent decided if we'll go for a brand new car or a second hand (couple of years old).
Would welcome advice into what potential savings could be made and what costs we need to figure in when doing the sums and comparing prices of similar cars/model prices between the South and the North.
Well if you're buying a 2nd hand diesel, in the north rather than mainland UK, be aware that the use of laundered fuel is much greater up there, and therefore the risk of buying a car with a damaged engine is increased.
Having said that my current car (of 18 mths / 45000 miles) spent its first 3 years as a fleet car in England, and it's been an absolute dream to own, so I'm not advising you against your proposed course of action!