By Jon Robinson Jet2 is parking its tanks firmly on Easyjet’s lawn as it announced its expansion into London Luton Airport – where its rival is headquartered. The Leeds-headquartered carrier is to start operating flights from the transport hub from next April. London Luton Airport will become Jet2’s 13th UK base and will offer 17 destinations. Jet2 said its move comes as a response to “strong demand” from flights and package holidays from customers and independent travel agents across London, Bedfordshire, Buckinghamshire and Hertfordshire. In recent years, the carrier has expansed into Bristo…