Tax Credit Renewal confusion

Hello

We are due to renew our tax credits pack, but don't actually get anything anymore as we now earn too much (hooray).

We got £300 due to their error last spring (april/may) which I think may now be classed as an overpayment, but was due to them putting the figures in incorrectly and this was blindingly obvious and I did call them about it. They put my income in (to the pound) twice and this generated a payment we could'nt do anything about. My husbands salary has been the same for years (or thereabouts) so the error was easy to spot and is definately their error.

Do we need to do a full renewal, the figures they've sent us look ok, so do we just do an auto renewal ?

I think we got some interest of about £40 earnt from savings - do we need to include this in renewal or will they already be aware

Just to clarify, we don't actually get any physical tax credit payments now. I started work last April and they stopped.

I would like to cancel our claim altogether because its a process we don't need to do anymore, but I shall wait till after the july deadline ? having gotten tax credits since 2002 I've never had to cancel the claim before.

Many thanks