FE,
£165 for a six month C1 or £60 for a 12 month C2; can't blame you.
My AME's answer is: C1 for issue or renewal. Then you can let it lapse to a C2 for five years so long as you return to the AME who holds your notes, otherwise its two years if you go to another AME. After five years, it's AMS at Gatwick for an initial again!! Wophoo. OK?
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Yabbadabaadoo. It's OK Boo-Boo.