Liam Gallagher wants to use a huge wall to beef up security at his mansion. The former Oasis rocker, 51, has applied for planning permission to build a new garden blockade at the front of his £4 million mock Tudor home in London. A 6ft-high hedge will also be planted at the 19th Century pad to help keep out intruders and spies, the Mail on Sunday reported. Liam’s planning agent was quoted by the newspaper saying: “The existing entrance gates and walls of the property do not provide the necessary privacy or security for the family.” Liam’s application added: “It’s important to note that many ne…