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Quote "....I went to the shop today with my valet key and the car started right up. So it would seem that the original master key lost its programming.................and now the valet key is doing the same thing as before.
No spark and No fuel, same as before this indicates that the immobilizer is kicking in preventing the car from starting."
BE-208 recommends checking the transponder key computer input when no key works.
If I was you I would start with the immobilizer box (transponder key computer ECM) and check codes on the check connector as described in BE-210 and so on (see code list & malfunction list).
Electronic Control Module - ECM - Key Computer location