Do you mean AffiliateWindow are offering 10% on Gala? This isn’t a surprise – they are always very low on casino and betting offers.
What is surprising is that Gala Casino don’t seem to offer an in house program.
My advice is steer clear – right now Gala have some allegedly major financial issues (this is hearsay and not to be taken as fact) and there are plenty of other options in the UK casino gambling space.