If you cannot agree to a compromise with your landlord over the Dilapidations then the case could end up in court. However, this a very expensive and time-consuming option which the landlord will generally avoid. Talk to your own surveyor and solicitor if this appears to be the direction things are moving.
It is always advisable to take professional advice before you accept your landlord’s Dilapidations claim in full. There may be elements of the cost which are inflated, or the claim might include items which are not relevant to your tenancy.