Is it better to exchange money in the UK or withdraw money in Japan?

Is it cheaper to have money exchanged in England or withdraw money in the UK before I got Japan? (I need Japanese Yen) I have a Halifax cash account (debit card). Also may I ask how costly would it be to withdraw money in Japan with a Halifax bank credit card? I may need to use that since I'm a little strap... show more Is it cheaper to have money exchanged in England or withdraw money in the UK before I got Japan? (I need Japanese Yen) I have a Halifax cash account (debit card).

Also may I ask how costly would it be to withdraw money in Japan with a Halifax bank credit card? I may need to use that since I'm a little strap for cash. Thank you for reading!
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