Jmurry the 345 was a cleaner sold on the mainstream market and it ran from 1975 until somewhere around 1983. I am not sure of the final date but what I do know is that it was an exclusive model at the very end and those last models came with a moulded 13amp plug. Electrolux did the same with the 502S too, they made the last models exclusive to Comet.
The 325 was exclusive but I don't know to which store. The only difference between the 325 and 345 was that most (but not all) 345 cleaners had numbers printed to the bag-full dial, whereas the 325 had stripes, like the 330 and early 345 did. Also the 325 had an all-round trim around the middle of the cleaner, and as I said before, there was a capped-off socket for a PN, which on UK models would not have been connected up inside. I am not sure whether the 325 came with it's own floor tools as seen in the rest of Europe, or whether it had the same automatic tool like on the 310/330/345.