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QUOTE ""-- Excellent advice, but do you really need a planning consultant? A good architect who knows their way around the planning and building standards systems should be all you need. If you are in Scoland it is all done on line, so they will know their way around the website too. A site visit or two, drawings and statements, logged onto teh system, a number of email questions back, pay the money and it should be Ok. I don't know what the sysetem is in the rest of the UK though.--"" END QUOTE.
Having spent the last 3 years working my way past refused retrospective planning applications and a resultant enforcement order, I would say that a dedicated planning consultant is exactly what you need! (By the way I've not had to pay any more for a retrospective planning application than for a normal one. Perhaps the 3 x price is only in Scotland.) An architect is an architect with a good knowledge of planning. A planning specialist is just that - a specialist with far more detailed knowledge and experience in planning than the average architect. At the stage you are now you need expert help. An hour with a good planning expert should cost between £60 - £90/hr and is worth every penny to find out exactly where you stand.
You say you have no savings - well then I'd say that from today you'd better start living pretty frugally, or sell a body part! Because unless you get some proper professional opinion from someone soon you will end up with an enforcement order which will cost you even more money to fight, and if you still try and save money by not fighting it, then there will be a court order for you to take the silo down, or you will end up with a large fine or prison.
As a ray of encouragement, I would advise you to put in a retrospective application as suggested by the local planning dept. They don't normally ask you to do this if they are minded to refuse the application. I also agree with what Pharnorth said about keeping them in the picture about your intentions, just so they don't think that you are ignoring them. But don't take to long with your application. Your lack of funds is not their problem. I also would not take too much notice of what the enforcement officer said. I have had experience of 3 different ones over the last 3 years and they have all given me wrong information, which would caused me no end of problems had I not checked up on what they said - some of it actually being in writing and blatantly wrong.