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You will need to contact the tax credit office, as we have no dealings with them, either by telephone on 0345 300 3900 and as they are very busy ring them as soon after 8am or as close to 8pm Mon 0 Fri or as soon after 8am and as close to 4pm on a Saturday with a better chance of getting through to an officer quickly.
Or by following the link here
This is the annual form, however I would ring them as the deadline is fast approaching, and its imperative that you alert them to the reason for the delay in potentially meeting the 31st July deadline