Just wanted to share my experience so that others waiting will have some hope!
Applied 12/2/17
Bio letter took three weeks to arrive
Bio given 10/3/17
Two weeks later Complex letter received
Then the waiting began....
Exactly 6 months from application date 12/Aug/17 Another complex letter received ( My case must be really really Complex

A few days later..
Aug 18/08 Bank alert IHS partial refund
Aug 19/08 BRP card received
Aug 20 All docs and passports received.
Thanks to members of this forum for posting their experiences so that I was able to avoid making silly mistakes in my application and the list of documents to put together shared by members was also of great help.
My thanks to the Almighty God for answered prayers - He has done it for my family again!
For those waiting just hope and don't forget to PRAY!
Nothing complex about my application, I guess they were just buying time. If the Home Office had waited just 1 month longer to issue my visa then, I would have been able to apply for 10 years settlement when this visa expires. But oh well, I'm glad because the waiting was killing me
