There's four tiers total, from what I've seen. Starts with a basic level everyone gets automatically just for signing up and playing a bit. Next tier up added a small cashback bonus and slightly faster withdrawal times once I hit it after a few weeks of regular play. Third tier brought in a dedicated support contact along with better bonus offers, noticed the difference pretty quickly once I moved up. Points needed for each tier climb quite a bit as you go, so it took steady play over time to progress rather than one big session. Full breakdown of what each tier unlocks sits within the loyalty section of
winplace-gb.co.uk, worth a look for anyone curious about the exact requirements. Top tier apparently includes a personal account manager too