Here come the gits: Westboro Baptists head to the UK

[Molyneux]

I think it's good for the rest of society that Westboro now begin to incite violence and murder of gays. They haven't done so directly, being very careful with skirting the law, but this is the first actual condemnation of a condemnation of murder of gays for being gay, which a skilled lawyer could use to argue that they are promoting the killing of gays, which is surely covered by a hate crime law somewhere.

In the US, even outright advocacy of killing of a group isn't generally prohibited unless you incite a riot.
IOW, I can print flyers and hold pickets saying 'Kill the Jews' or whatever and not be prosecuted.
It is illegal though to threaten a specific person (example: 'Kill the Jew insert name here').
The line between legal/illegal can be vague, but the Phelps's are very careful about not crossing that line.
But laws are different in the UK and perhaps they'll accidentally cross the line.

In which case, feel free to keep them for a while.

Nitpick: you can be held liable for a call to action. "Jews are awful, horrible, monstrous people" would be legally defensible. "Kill the Jews" would not.