Bought myself a Jack and Jones hoodie which arrived today. I can't complain at just over a tenner, nice material and will suffice for summer (I'm always cold, even when it's 30C).
Amazon have small chest, 42, 44, 46 all under £11 delivered.
Amazon also have some other nice J&J hoodies, such as this under £15:http://www.amazon.co.uk/Jack-Jones-Mens-Sweat-Hoodie/dp/B00DOVWKZK
Hope it helps ;-)