Hi Stuart
Not a typo, merely my mistaken memory. You are correct A4 is better than A2. A2 is however what I tend to buy as balance of cost versus resistance. A4 tends to be aimed at harsh environments, think salt water etc from what I can see. There is another type, A1, which I understand is less resistant than A2.
On a positive note, having sorted out the steering column, I had been looking in a number of boxes for the keys for the car without success, however today a further dive into the very cluttered shed revealed a number of small takeaway containers with various dashboard etc parts and in one of them were two door keys and a single ignition key. I checked with the barrel on the column which worked ok and the two door locks use the same key which is a bonus. I have not come across the boot lock yet to try that, but hopefully it will fit the existing keys I have. I contacted John Richard in the Wirral who cut the keys for the Spider and he is still making them. He said send a photo of the profile, so hope he can cut a couple using that, if not will send up the key to him.
Peter