A takeover of FTSE 100-listed insurer Legal & General Group PLC (LSE:LGEN)'s housebuilding subsidiary Cala by fellow footsie constituent Persimmon PLC (LSE:PSN) would be a boon to the former's share price, according to Deutsche Bank analyst Rhea Shah. “City sources” told Sky over the long weekend that Persimmon is interested in the £1 billion auction.