Car insurer Admiral has seen strong growth so far this year, although things are tougher at the website business Confused.com.Turnover was up by 56% in the first quarter compared with the same period last year at £539m, Admiral said in a trading statement covering 1 January to 5 May."Admiral's UK car insurance business had another great quarter and has continued to benefit from positive market conditions," said chief executive Henry Engelhardt. "We grew rapidly and were also able to raise premiums."At Confused.com though, "turnover is flat and margins remain under pressure," Admiral said.---RG