Hi, just want to let you know that my wife has received her visa last week and BRP card today.
Like I mentioned above, we have applied for extension 11 months before her expiry date and paid £600 health surcharge with the new application.
She has got the visa until 2020 and also they refunded £200 back from health surcharge automatically to my card which I used to pay the fee.
We felt happy that UKBA has refunded the amount without us questioning them at all
Hope this helps everyone who are applying early.
And special thanks to CR001 for her prompt replies.