Samsung UK has the following Promotion:-
Up to £100 off when you trade in your old smartwatch
Valid from 04/05/2020 09:40:00 to 30/06/2020 23:59:00 inclusive; please do not attempt to use outside of this period.
Terms Apply :- Purchase from Samsung Shop Online by 30/06/20 (11:59pm). Selected trade-in devices only. Values will vary based on model and condition of trade-in. £100 value based on highest value trade-ins, which are Galaxy Watch 4G 42mm and 46mm, Garmin Quatix, Forerunner 935, and Apple Watch Series 3. Charges apply if you do not send us your trade-in device within the specified timeframe. T&Cs apply.