The head of the RAF has warned that Britain faces a “serious threat” to the nation’s “warfighting ability” due to a lack of radar planes. Air Chief Marshal Sir Richard Knighton said the UK did “not have an airborne early warning capability at the moment”, despite it being “fundamental to our ability to protect our country.” The RAF retired its seven-strong fleet of E-3 Sentry planes in 2021, amid plans to replace them with the more advanced E-7 Wedgetail made by Boeing. However, due to delays, the first of the new jets are now not expected to arrive until the second half of this year, the Gove…