Menu names may vary slightly depending on your version of Android/Manufacturer. Goto Settings -> Apps -> [Your Browser] -> Advanced -> Open by Default Then click on "Clear Defaults" Your Browser = which ever browser is opening the link by default.
Look for apps, default apps on your phone. For me, although Google play app is set to open play store links, the issue is that the link associated with the get deal button is referral url so it detects hotukdeals website and only offers a browser to open the link. Same issue with Amazon or eBay deals.
£5.49?? Mine says