A couple more useful sites that I’ve used recently and can recommend.
A nice idea - 'Scavengers offers a unique bespoke service to source and reclaim that period piece of furniture you've been looking for. Baths, beds,sinks, taps, fireplaces, mirrors, chandeliers, radiators, garden furniture, doors and much, much more.'
So if you want something antique but don’t know where to start looking then get on to Scavengers and they may be able to find something to fit the bill for you. I bought a chandelier from Scavengers which despite having a bit of a battering in transit should work well in the barn. I would never have found myself rummaging through antique shops or trawling ebay.
A great choice of lighting at low prices. Some of the quality isn't the best but you get what you pay for. I especially like the order tracking that lets you keep track of exactly where your order is - right down to links to the Parcel Force website that let you see who signed for the items on delivery.