By Jon Robinson Profit at diamond, jewellery and watch retailer Beaverbrooks has been slashed despite it reporting another year of record sales. The family-owned retailer has posted an operating profit of £10.5m for the year to the end of February 2024, down from the £25.7m it achieved in the prior 12 months. Beaverbrooks said its profit had reduced because of an increase in operating costs and “significant levels of long-term investment”. The Lytham St Annes-headquartered company added that its turnover increased from its previous record of £225m to £228.6m. In a statement, Beaverbrooks said:…