When you order a physical card or create a new virtual card, you can define the spending limit per month for each individual card, up to a maximum of 100k GBP or equivalent in your base currency. Admins of your account can change this limit anytime in the Settings tab of the web interface for each card.
While ordering a new card, you can also link currency pockets to it. You can link one of each of your active currencies. Admins of the account are able to also link/ unlink currencies to cards in the Settings tab of the web interface for each card.