Aerial

The radio aerial on the back wing is a Blaupunkt (i.e. Bosch) Autoflex helical whip aerial with alternating wiring direction - code number 8 698 114 571 (as per the UK 2005 catalogue). You should be able to order them through any Blaupunkt dealer (got mine from Halfords) and they cost a fraction of what Lotus charge.

N.B. This aerial has a fine thread M4 x 0.5 bolt that screws in to the aerial mounting on the wing. From my experience Lotus has used different threads on the aerials at different times so worth checking your old one first. If it is different, then you will need to buy the complete Autoflex unit including the mounting block (code 7 691 270 001). Should still be a lot cheaper than buying a replacement Lotus aerial which may not fit your existing Lotus mounting block anyway (the last Lotus one I bought didn't).

P.S. For the more technically minded this is an 'active' aerial. There is also a 'passive' version, code 8 698 141 571.