im going to be in europe for a month, staying at friends and family and going about by bus and train.

how much euros and pounds would be recommended for me to bring along if i spend 1 week in germany, 3 weeks in england/scotland?

where is a good place to get good rates?

also, i use HSBC, would it be better to just withdraw my cash from HSBC Atms in europe instead of bringing one lump sum?

thanks loads.