This is a common enough bird but one that is easily missed. I see them from time to time, not often enough to be honest and, up until yesterday I haven't managed anything half like a decent photograph.  It always amazes me that when I do see a relatively new (for me) species, how taken I am.  Fundamentally that's why I love birds and wildlife so much, it genuinely gives me immense pleasure to see them close up.  In the same way that you enjoy to see a nice painting, a stunning flower, or even enjoy a piece of music, there is just something extremely attractive about a bird.  They come in so many shapes and sizes as well as colours, their variety  is amazing.  Here is a little bird that has evolved to literally hang on to the bark of a tree, and in this case as you can see a wall.  They use their long probing beak to winkle out insects from between the crevices in bark and obviously, cracks in walls. They have a tail specially adapted to support them. They are said to move around in the company of tit flocks in the winter time but I would hazard a guess that they are in the same place as the tits because that's where the food is. Their plumage is described as "cryptic", that means camouflaged and probably explains how you can overlook them very easily