@Peter47 +1
...As an aside, the Economist magazine is right. We shouldn't have a sign at airports saying Border Force but stating Welcome to the UK...I much preferred it when immigration staff didn't have uniforms. It didn't make them any less effective...
An in your face
UK Border sign is extremely poor psychology. If you are attempting irregular entry it's unlikely to make a difference since you have already decided to try. If you're a regular/tired/grumpy traveller it's a red rag to a bull that makes matters worse.
Border Force obviously bought the uniforms from Primark. Without disrespect to individual officers some, er, don't really wear them well. When they wore their own choice of smart civilian clothes they seemed nicely understated and probably more effective for that