12 A pilot stage was used to test Airwave over a six-month period in Lancashire and other police forces will join the new service through a phased roll-out with thorough testing and validation at each stage. Problems were encountered during the pilot in demonstrating that the required level of coverage had been achieved, particularly on major roads. PITO considered that the deficiencies were significant while O2 believed that there was a problem in measuring coverage and that, in operational terms, any deficiency would not be noticed. The problems led to an extension of the pilot period but were not fully resolved before Airwave was accepted, albeit on a conditional basis. This will allow a substantial portion of the income stream to begin flowing to O2, potentially reducing the incentive to take action to meet outstanding contractual conditions. Nevertheless, the service has been running successfully in Lancashire and PITO has been particularly careful to seek financial recompense for any failure to deliver, as well as retaining an option to step back to pilot status if key elements of the contractual requirements are not resolved within an agreed time frame.