The links below take you to the NCETM's (National Centre for Excellence in the Teaching of Mathematics) video lessons. There are multiple short video lessons via each link. You should work through them at your own pace. Keep a pencil and paper handy so you can pause the video and participate.
These lessons are only if you want to do something extra in addition to other work set. They provide excellent consolidation of key concepts. Should you require further practice having watched all the video lessons, log into MyMaths (there's a link on the previous web page) and select lessons on those topics where you feel you need extra practice (for instance: statistics, geometry or algebra).