The US has refi fees too. Whether it is worth it depends on how much longer you will stay in the house. It can be worth it if it it reduces your payment to something manageable with the option of only increasing the length of the mortgage by a little bit, i.e. borrowing the money for longer. You pay more in interest over the lifetime of the loan unless you can refi again at a lower rate.

I suspect if you calculate the expected average interest rate over the length of your ownership and the fixes (2-3, 5, 10) you'll get a similar number even with higher volatility in the specific rates. But you'd have to run the numbers/math.

This of course does nothing for the many 12-24 months of higher payments even if it evens out over time.