Now Britain's most desirable status symbol, hot tubs have become big business. This documentary follows Dennis Holmes, his son Dan Holmes and son-in-law Ross Phillipson, who are the proud owners of the country's biggest hot-tub superstore, which has an annual turnover of more than £10million. Cameras follow the men and their staff throughout the company's busiest period of the year, but as the business grows, so too does the tension among the workforce. Plus, hot tubbers up and down the country reveal why they love the bubbles so much