Biometric letter not received yet

Hi

I made application for naturalization (5Yrs T1 + 1Yr ILR) on 7-Sep-2015.
Since CC payment failed, I received letter to repay dated 22-Sep-2015.
I made repayment through cheque that cleared on 8-Oct-2015.
However, since then I haven't heard back from Home Office.

Also, I have moved houses in mid Sep which I mentioned in my application form but somehow HO sent re-payment letter to old address. I am checking post at my old address but haven't got any biometric invite.

Should I be worried. Whom shall I call or get in touch to know if I have missed any letter.

Many Thanks
Abhi

The HO advises that the application process can take up to 6 months. My biometric letter arrived 6 weeks after the fee was taken.

Unfortunately you will need to have some patience when dealing with the HO. But from what I have been reading approvals are coming through. I am awaiting approval and it so far is well within the 6 month allotted time frame for a UKM and I am in Australia!