I have an IPhone 6 which the other week stopped working on any Wi-Fi unless it is about a metre away from the router

This happens on bt Wi-Fi connections even when other devices work on it completely fine, however it does work when on virgin media just fine. Any ideas as to what has caused this?

The question is rather confused:

"stopped working on any Wi-Fi" and "it does work when on virgin media just fine" contradict each other.

By "bt Wi-Fi", do you mean Wi-Fi from a BT router, or are you referring to BTWiFi hotspots? Note: Wi-Fi does not come from the ISP, it comes from the router, which converts the ISP connection to provide Ethernet and Wi-Fi connections.

Log on to your router and try changing the wireless channel to see if interference from other nearby networks is the issue. This can affect certain devices but leave other unaffected. On 2.4 GHz, try all 13 channels. If the phone also supports 5 GHz and the router is a recent BT model, then try 5 GHz instead.

Perhaps you can update the question to add a few clarifications.

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