Hi Jakes,
Welcome to the forum, which Farnborough are you referring to, Hamshire or Kent?
Overseas suppliers are pretty much commons sources for parts nowadays but you have to weigh up the pros and cons. I always try to buy locally if I can get what I want for a reasonable price, you can usually buy cheaper abroad but that is not always the fault of local suppliers who also have import duties, vat etc to contend with. Just beware that if you buy from eBay or the like that you pay using PayPal which will give you a degree of financial protection.
Support your local suppliers whenever it is viable to do so, there are several advantages. You get your stuff pretty much next day, it's easy to return it if there is a problem or you ordered the wrong thing and you get helpful advice too.
Good luck.