I can agree with most that you have written, Marsh, but how can you honestly say that the site where the WRC pods are is well shielded? It's on, what is for the Broads, a hill (gentle slope) overlooking the river!
That aside I don't blame the BA for treading cautiously on this one but if it's an implicit 'No' at this stage then I think that that is premature. I also think that there are enough folk on this planet that simply want a razz-matazz free holiday, maybe a short walk to the pub of an evening, a spot of fishing and a river bank to sit on and meditate, for a small glamping site besides the river to be very popular. Visual impact I don't mind, unless its unsightly.
Call an area a national park, whether it is one or not, in order to attract visitors means that the Broads must be able to cope with the subsequent demands, the Authority can't have it both ways. Me thinks an open minded approach is called for on this one, just as it is for Jenner's Basin at Thorpe.