The last time i visited UK was 2006, too, so I think I can't help you much there. But from my experience UK is the most expensive country in Europe in terms of livelihood.
As I unterstand, you want to travel through different european countries instead of travelling directly from Braga to the UK? Then the rail ticket is great. Instead I would recommend to fly.
If you travel through Germany, then:
1. give me a call, once you are in Munich.
2. I can give you some information:
The prices differ very much, depending on the place you are. Munich might be the most expensive city. Cities in the eastern part of Germany are cheaper as well it gets cheaper the smaller the cities are.
DON'T CARE ABOUT TAXIS, YOU WON'T NEED THEM. We have a tremendous public transportation system, you can get wherever you want.
Prices in Munich (1 is $1,45 to $1,5):
Beer (0.5L) in a bar: 3,00 to 3,50
Meal at McDonalds: 5,50
Normal food at a restaurant: 6 (cheaper restaurants) to 20. You can eat cheap and very good, if you want.
Beer in the super market: Per liter from 0,7 (bad beer) to 1,5 (good beer)
Bread and cheese in a super market for at least 2 days: 2 to 3
Day ticket for the Munich transportation system: 5.20 (city) to 9 (including suburbs and airport). Normally the cheap one is more than enough to travel.
Actually I don't have a good overview over hotel prices, though.
Feel free to ask more.