We got the forms from SSE, which made more sense than the drivel from the EST. A phone call to OFGEM helpline eventually got through. A helpful chap apologised for the confusion, which he said was not just restricted to me. He did say the forms should have been better written.
There was no mention on them of microgenerators already RO registered just having to switch to FITs by getting a form through their supplier.
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P J