Marketing managers are forecasting increased sales growth over the next 12 months. They predict sales volume growth of 6.3 per cent compared to 5.4 per cent in the previous year. But prices are also expected to increase by 2.1 per cent, compared with planned rises of 2.5 per cent reported three months ago. The forecasts emerged in the latest Marketing Trends Survey by The Chartered Institute of Marketing. CIM officials say the reduction in the planned rate of price increase is an indicator that the upsurge in inflation caused by the weak pound and last year's price boom could be over. "This is especially important since the Governor of the Bank of England has been arguing that the risk of accelerating inflation pointed to the need to raise interest rates," said a spokesman.