The number of mortgage approvals hit the highest in almost five years in August, while property values advanced the most in six years in September, fuelling concerns of a growing housing bubble, while the tendency is expected to persist in the nearest future. On Monday London-based property researcher Hometrack said in its statement that average values in England and Wales ticked up 0.5%- the most since May 2007, and 0.1% higher than a month ago. Annually prices accelerated 2.4%.An increase was recorded in nine of 10 regions tracked by the company.