I went to Decathlon in Surrey Quays to get my bike seat adjusted. Apparently, the seat post was too small, but they tried to adjust it anyway. They broke the ring to adjust the seat post in the process. I didn't have a choice but to buy a new seat post from Decathlon, as they broke my bike and I couldn't put the seat back in. Without asking, the guy installed a new seat post, which was much more expensive than what I wanted to spend on this. He also told me that the ring was broken, as if he had forgotten that he himself broke it just a few minutes before. Not a very customer friendly experience.