Your solicitor will advise whether the premium is so low as to invalidate the claim, but our advice would be don’t ignore the claim but respond with a counter notice within the correct time frame.  This can always be done on a “without prejudice” basis if there are serious doubts about the validity of the claim.  Your solicitor will need to obtain advice from a surveyor who specialises in leasehold valuation work and your counter notice will specify what premium he considers is appropriate.