Full marks to Chain Reaction, I emailed their warranty dept about the broken guard yesterday evening and just received an email from them:
We are sorry to hear that your SKU261453 - SKS Longboard Mudguard Set
Black - 28" - 45mm is faulty. On this occasion we are sending you a
replacement and there is no need to return the faulty item but please
dispose of it accordingly.
This should be dispatched within the next working 24 hours.
Full marks to Chain Reaction, I emailed their warranty dept about the broken guard yesterday evening and just received an email from them:
Great service as far as I'm concerned :)