I'm uncomfortable with the police coming in and taking them away as a crime.
Those things are indisputably racist, and I wouldn't drink at that pub (and would let my friends and family know that I didn't and why I didn't), just as I've avoided buying things at seaside shops that display them, and I'd make my own personal judgements about the likely character and judgement of people who proudly display them (though I also know adults whose much-loved childhood bedtime cuddly toy unfortunately happened to be one of these, and I wouldn't hold it against them if they still had theirs in a cupboard somewhere as they didn't feel able to throw it away even after discovering the connotations later in life).
I'd back anyone campaigning for those who display them to learn why they're racist and upsetting, or asking them to remove them from display, or advocating people boycott the business until they're removed.
But unless maybe you can argue that they've been displayed in an attempt to disturb the peace, or as messaging to keep black people away from the premises, i.e. they can be shown to be breaking the law in some other way rather than just being dealt with under hate speech legislation, I'm squeamish about bringing in state powers to control what people can say and do, even if those things are racist or otherwise discriminatory.
I'm not black and I guess I might feel differently about this if I were, but I do belong to other groups that are often victims of discriminatory treatment, and I feel similarly uncomfortable about restrictions on what's often described as hateful speech or conduct.