I have lived in Brisbane for nearly 6 years now.......and i LOVE IT. Don't believe those people that tell you it's still in the 1970's, what a load of rubbish. Brisbane is a modern, vibrant city with great bars, cafes, restaurants and shopping. I personally live 6 km away from the CBD and as the public transport is so easy, I manage to get from door to my daughters school each day in less than 10 mins. Obviously if you go by car, then like all major cities, there is the typical rush hour traffic, so try to avoid it. After moving from London, trust me the volume of traffic is much, much less!
Overall, Brisbane is a beautiful, safe and great place to live and work Brits fit in just fine. Its up to you how you integrate with your new surroundings that will decide if you fit in. Make as many new friends (not just brits) and you will be just fine. You wont regret your decision.
I hope this helps, if you need any help please let me know.
Paul