Here’s our guide to cozy indoor UK music fes­ti­vals from Feb­ru­ary to May. Leave the foul weath­er rag­ing out­side and get all toasty inside your favourite venues with a ver­i­ta­ble feast of music. Hope­ful­ly you’ll find some­thing to float your musi­cal boat and put a spring in your step. And if you know of an…