Italian chain Spaghetti House has shut all its restaurants after its parent firm tumbled into administration. The historic London hospitality brand has made all 101 staff redundant as a result, with bosses blaming higher costs and “difficult” conditions in the face of “global instability”. Lavval Restaurants, the group behind Spaghetti House, appointed corporate finance specialist BTG as administrators last week. Administrators were hired to help wind down the business and have since shut its remaining five sites, all based in central London. It is understood the company had already shut three sites in recent months, based in Mayfair , Goodge Street and Fitzrovia. Spaghetti House was founded by Simone Lavarini in 1955 and remained owned by the family. The group’s Knightsbridge branch was in the media spotlight in 1975 when three robbers took the restaurant’s staff hostage following a failed robbery.…