Bird ID - Help needed please!

Hello,

I saw a little bird the other day outside the kitchen window. I haven't seen it before in the garden and am a bit stuck. The picture is really bad quality, apologies but you can see the distinctive black marks on its face. I originally thought a common firecrest but I'm not so sure after searching. I think I've managed to upload a short video of it which is where I took the picture from. 

Does anyone agree with my ID of it? 

Thank you