From experience in the lender I work for and the valuers we use, very few of them would be open to changing their valuation amount based on a subsequent valuation from an independant. Whether this is because they don't want to set precident within their company or they would rather their word is final being that they've been instructed by the lender, not you, I don't know.
Hopefully the independant surveyor comes back with a figure you're hoping for and the Estate Agent/Broker/You are able to find some comparables that are particularly good so that you're able to appeal (if the lender allows this?).
From experience in the lender I work for and the valuers we use, very few of them would be open to changing their valuation amount based on a subsequent valuation from an independant. Whether this is because they don't want to set precident within their company or they would rather their word is final being that they've been instructed by the lender, not you, I don't know.
Hopefully the independant surveyor comes back with a figure you're hoping for and the Estate Agent/Broker/You are able to find some comparables that are particularly good so that you're able to appeal (if the lender allows this?).