can't rely on congress for any legislative action so you'd have to rely on narrowly tailored executive solutions like the magnitsky sanctions for melanie dawes, the head of ofcom, for the violating the universal human right to free speech without the fear of government retribution. other solutions would lead into a downward tit for tat spiral like having the fcc banning british Phones from US carrier networks. it would hurt us more than the uk because the british are poor and getting poorer so they can't afford to travel here where as we're rich and go wherever we want.
tailored sanctions for the head and board of ofcom is the only way to get them to behave. and if trump can't stomach a financial sanction, he can write an EO that labels dawson one of europe's worst human rights offenders and ban her from travel into the us.