Well I took the plunge and called tech support.
They wanted to send out an engineer but I just can't afford to lose a day off work ATM for an intermittent fault. So I asked if I could have a replacement modem posted to me.
Tech support put me through to customer services and they put me through to sales who had no idea why they had put me through to sales.
It appears that it is not possible to simply have a replacement modem supplied without an engineers visit. Why do I have to lose a days wages to wait for someone who may or may not actually turn up to do something I can very easily do myself.
