We use a company called HIFX (
Foreign Exchange Specialists | HiFX plc) - if you call them on: 01753 859 159 they will be able to give you some good rates. I found them really efficient and our money transferred within a day from them. Banks don't give as good rates as companies which specialise in foreign exchange (such as HIFX). I did a lot of research into various companies (as one need to feel one can trust them) and I read a lot about HIFX, which transfers millions of pounds a day around the world. I have noticed that Ozforex is advertising a lot on Pomsinoz, and this website gives you current interbank rates:
Oz Forex Foreign Exchange - Interbank Rate Snapshot. The rates you may receive are slightly less than this, but at least it gives you an idea on how the exchange rates are going. I haven't used Oxforex to transfer money, so don't know what they can offer. Hope this helps! All the best.