Yes, you need to show that you can speak English for most skilled jobs if you're applying for the Skilled Worker visa. You can prove your English skills by taking an approved test like IELTS for UKVI, having a degree taught in English (which needs to be checked by UK ENIC), or if you come from a country where English is the main language. Usually, you need at least a B1 level on the CEFR scale. It's important to meet this requirement to get a visa, no matter what job you want to do. If you're in healthcare, there might be extra rules to follow from organizations like the NMC or GMC when you apply for your license.