CHC London:
Bank drafts / bank cheques have limited validity. Ensure that your bank draft / bank cheque is not older than two months when it reaches this office.
This office does not accept:
Cash
Uncertified personal cheques
Company cheques
British pound drafts drawn on foreign banks
Canadian postal orders
Euro-cheques
Credit or debit cards
Canadian dollar drafts where the “clearing bank” is not in Canada (check with your bank if you are unsure)
http://www.canadainternational.gc.ca/united_kingdom-royaume_uni/visas/fees-frais.aspx