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ww.cranfieldaviation.com
CATS address is as above. The interactive tutorial is great. I haven't fully subscribed yet as I am hoping to complete the PPL theory in-house (they run a residential course), BUT and it is a big BUT, to date I have found that there response to emails and telephone calls is abysmal, so I am not sure. Having said that, I am reliably told that they offer a 1st class service ONCE you get there!