I bought a Silent Night electric blanket and I am really pleased with it. I went on the amazon website to check the reviews and I noticed someone say that they had bought a King size one for a double bed, so I went into the Bury shop and bought a King size, it was only £5 extra and I'm so glad I bought it as it fits nicely across the mattress from edge to edge. My dog loves it too as she used to snuggle up to me in the night when it became cold. Now she has her own fleece blanket on the bed and I keep the electric blanket on the lowest setting all night and we are both as snug as bugs in a rug.