How much does it cost to take a complete Amazon and prep it to be competitive for say Le Jog?
It depends how competetive you want to be really. When i build a car I go for a catch all spec- with this spec you'll be able to do stage rallies as well as things like Le Jog and the Monte.
You could buy an Amazon on eBay for a couple of grand, put £200 worth of tyres on it, some £20 spot lamps, spend another £100 on navigational aids and do the event no problems. At the other end of the scale you could have a full works replica with all the tweeks for around £30,000 on top of the car.
The car i have is a genuine ex-factory car that did Monte and the Safari in period (and looks suspiciously like the white one above) that has done 3 Monte Challenges, Trial to the Nile, 2 Winter Challenges, London to Barcalona, 3 Cassic Marathons, London to Prague as well as Le Jog and around 50 UK events. Its a little tired now and is due a freshen up over the winter ready for more action next year. Its a tricky one to put a value on having so much history.
Le Jog is a great event but its tough, you might want to start on something a little easier if you haven't tried this kind of thing. 4 days and nights of almost non stop motoring through the worst of the winter with incredibly tight schedules and taxing navigation as well as all the tricks that they throw at you is enough to make you drive of the cliff at John-o-Groats should you ever make it.