I don't think it wouldn't be safe right now but I have doubts about the time of that delivery. If the store is not in the UK you may lose a lot of time just waiting for them to send the items to you. Maybe there is something related to Warrior Cats that can be found nearby? Check on that, if possible. Also if there is nothing you can get, you can prepare a gift by yourself, like a cup with some of the Cats' characters or maybe a photo calendar, there are websites where you can create photo calendars with your own pictures like Photo Calendar creator. Or just print a poster via Shutterfly if that's possible. Children love having everything related to their favorite characters. it doesn't have to be an official merch item.
Parents-in-Law. What do/did you call them?
Gary Glitter programme Tuesday