By Jonathan Davies

Broadband and mobile network provider TalkTalk has seen its share price plunge 8.5% despite a "good start" to its financial year.

TalkTalk reported a 3.5% rise in sales for its first quarter, but shares fell dramatically after it raised concerns about the UK's broadband market.

It described the broadband industry as "softer" during the three month period, largely due to "high promotional activity" among its competitors.