EuroCarParts.com 30% discount this weekend use code WEEKEND30. Useful for pressies!
Code GIFT10 offers 10% off car batteries AND free winter Car Kit worth £19.99. This can't be used in conjunction with other offer but is available until 31st Dec 2016 so could always order after Monday if useful to you and you need other things that can be ordered over weekend.
Also ECP offer 3.85% on Top Cashback but cannot be used with above offers but useful any other time. :)