"This is a contractual matter between the Home Office and Motorola Solutions and this investigation threatens the principles of long-term government contracting in the UK,"
The investigation will do no such thing. The outcome might, but were they found innocent then I can't see how there could be any detriment to the principles of long term contracting. The only way that an investigation would threaten the principle of long term government contracting would be if the supplier was found to have abused their market position, in which case there would be a massive scandal.