As it was locked with the fob and now it does not work you need to know the EKA code to remobilise it,you can get this from a LR dealer.Most 300TDI's had a passive ring type immobilser so really you need to get another fob coded up,(pref 2 of them) to avoid this again.Using the EKA code is not quick,so its just as its letters mean,Emergency Key Access code.Fobs are about £30 odd + Vat and I generally charge £20 to code them if the car is brought to me.Most Indys seem to charge a similar or slightly larger amount.Good luck if you try a main dealer.