Weakened NHS demand has impacted on Allied Healthcare’s results for the first quarter of 2006. The NASDAQ-listed healthcare staffing provider, which is now dual listed on AIM (HMN February 2006), reported revenues of $75.9m (£43.4m) for the quarter compared with $86.6m (£49.5m) for the same period in 2005. Gross profit also dipped to $23.7m (£13.5m)…