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At all time during the said term to pay and contribute one moiety of the expense of repairing maintianing and rebuilding the roof foundations and main strucuture of the building of which the demised premises form part and (b) a rateable and due proportion of the expenses of making repairing
maintaining supporting rebuilding and cleansing all ways passageways pathways sewers drains pipes watercourses water pipes cisterns gutters party walls party structures fences easements and appurtenances belonging to or used or capable of being used by the Lessee in common with the Lessor or the tenants or occupiers of the premises near to or adjoining the demised premises or of which the demised premises form such proportion in the case of difference to be settled by the surveyor for the time being of the Lessor whose decision shall be binding'
so it's 'a rateable and due proportion of the expenses re the pipes (we have an easement over the pipes).
what is a rateable and due proportion?