The Prospect union signed a workplace access agreement with Google UK on Monday, covering roughly 7,000 workers across Google's UK operations including YouTube but excluding DeepMind. The deal is a direct consequence of the Employment Rights Act, which came into force and grants unions the statutory right to enter workplaces and communicate with non-unionized employees. Google framed the agreement as compliance, not partnership. This follows a similar Prospect-Meta deal covering about 5,000 UK employees. DeepMind is expected to negotiate separately with the Communication Workers Union. The pattern is clear: the legislation is converting big tech's UK operations from union-free zones into organizing territories, company by company. The mechanism matters. Previously, unions seeking recognition had to organize from outside workplace walls — as the GMB discovered when its effort to gain recognition at Amazon's Coventry warehouse was thwarted two years ago. The new law flips the access default. Unions can now run sessions inside workplaces, including Google's King's Cross headquarters, and from January employers must inform workers of their right to join. Prospect general secretary Mike Clancy called the agreement "a powerful signal of intent" and framed the union's ambitions broadly: pay, flexibility, AI deployment, and workplace culture. TUC general secretary Paul Nowak predicted a wave of private-sector recognition deals over the next year as the new rules take effect. Google's response was carefully calibrated. A spokesperson said the company signed to comply with legislation and emphasized its existing internal employee representative groups and "respectful, direct dialogue." The subtext is unmistakable: Google views this as a regulatory cost, not a cultural shift. Whether that framing holds depends on whether Prospect can convert access into actual membership density. The structural question is whether access rights without mandatory recognition create real bargaining power or merely performative presence. Prospect represents over 160,000 UK workers across sectors, giving it institutional heft. But tech companies have deep experience channeling employee voice through internal forums designed to make unions feel redundant. The Employment Rights Act opens the door; it doesn't guarantee anyone walks through it. The 20-year view splits sharply. If access agreements become the entry point for genuine density and eventually mandatory recognition, UK tech operations develop a labor relations infrastructure that continental European workers already have. If access stays cosmetic — sessions in conference rooms, leaflets in kitchens — big tech absorbs the compliance cost and continues operating essentially union-free. The legislation bet is that access is the bottleneck. The next two years will show whether that bet was right.