Founded in 2000, Bytemobile had raised more than $56m from Innovacom, Eastven (which had been the corporate venturing unit of Ericsson) and venture capital firms Benchmark, Trident Capital and CrossBridge Venture Partners.

Vodafone bought a 21% stake in Invitation Digital in May last year and also has the first option to increase its direct shareholding in the future.

The existing shareholders were SSE Ventures, Scottish Enterprise and Logan Energy.

SSE has agreed to acquire 40.05% of Wind Towers from Marsh Wind Technology to take its total shareholding to 80.1%.