Hi! I'm not from UK, but from Germany, and have been in Cardiff last year for John's concert. As far as I can tell, 200 pounds per day should be more than enough! Meals in restaurants we went to were in between 10 and 15 pounds, 20 pounds at the max, depends how fance you want it of course. The busses in Cardiff were cheap, between 1 and 3 pounds, and that goes also for busses going to the surrounding area.

I don't remember the entry to the Cardiff castle at the moment, but maybe around 7 pounds? And I heard many museums are with free entry in London. Of course I don't know about the tube or meals in London, maybe somebody else can enlighten us on that.

My friend says, an Oyster card is great to use for the tube in London. You load it with money and then pay the subway tickets with that, mabe it is even cheaper than buying single tickets? I could ask to clarify.

It is a long way from Australia, but I really loved Cardiff and I don't think you will regret it. Also, seeing John live definitely beats the DVD. I will be back this year as well.

If you are interested, I did write a detailed report about last year's concert, with many video links included

http://dieastra.livejournal.com/21357.html

and also a report with lots of pictures of Cardiff and Torchwood/Doctor Who locations, it is not finished yet, but here is what I have so far:

http://dieastra.livejournal.com/21151.html

Enjoy!