Hilton debit card UK vs overseas spending for bonus points

[Jumble Tales]

Forgive me if this has already been answered:
In the marketing emails from Hilton the terms read ” first £500 of eligible purchases spent domestically or abroad…” whereas the application link reads “…Earn 2,500 Bonus Points when you spend £500 in foreign currency…”.
Does this mean online F/X spend in while in the UK or is GBP Sterling eligible spend?
Thanks..