Keep on digging! you might have been told that the market was sluggish and that there was only a few people viewing your house which is an excuse they use to undersell.(posted 7616 days ago)My lender used this excuse... But after sarning the estate agent, lenders solictitor etc I found that there was ten viewings rather the the 3 they originally said. Their lawyers even sent me the records of every person who viewed...(not appropriate under the data protection act).
Remember to check Land Registry records for any similiar/identical houses sold around the same time...the comparisions might be a help to you !
Good luck