Using Foreign Groupon in UK as UK citizen

Hi all

I am going Germany on a driving tour in July so was checking out offers on Groupon.de for restaurants and tourist stuff when i came across this hotel offer for Edinburgh

Deluxe room for 2 people in the Hilton Edinburgh for 114 Euros on the date i picked 15th March

The same date for same hotel room on Hilton website £130 and booking.com is £121

So my question is if i bought this or other hotel rooms would there be a problem being a UK citizen not a German citizen ?

https://www.groupon.de/deals/ga-bk-hilton-edinburgh-grosvenor-hotel-1#check_in=2019-03-15&check_out=2019-03-16&ga_deal_value=MTQ3