VMO2 and CityFibre are reportedly holding merger talks, which would bring together by far the two largest fibre builders competing with Openreach.

On a conventional altnet acquisition assessment, CityFibre is an attractive target given its scale, but a very expensive one at a full price given the degree of overlap.

The acquisition might still be attractive given the opportunity to take out a wholesale competitor but, for this same reason, regulatory clearance would be very tough.

Providing home broadband connections via a mobile network (FWA) is gaining traction in certain markets where local conditions make it a viable alternative to fibre, such as New Zealand, Italy and the US.

FWA is a time-limited opportunity for most, with mobile traffic growth absorbing capacity for it and fixed traffic growth depleting the economic case. An ultimate shift to fibre is the best exit strategy.

In the UK, H3G's spare capacity could support up to 1 million FWA customers on a ten-year view—enough for a meaningful revenue fillip for H3G, but not enough to seriously disrupt the fixed market.