In my experience UB don't automatically pass on, you need to phone up for a new rate list each time. On plus side they've kept competitive with pretty much all offers going the last few years as long as you meet loyalty criteria but you need to keep an eye on it. Also very easy to change bands, they do an online assessment, took 2 mins and as long as you're happy with figure that's it done, no fee.
+1
Their rate is now 3.0% if you have LTV of 60% or less + owe more than 200K and have a current account.