Generally it is found to be unhelpful to focus on any particular M3NHF Schedule of Rates item. Schedule items are deemed to include everything necessary to do the job. The contract says:

Each item in the Schedule of Rates is intended to represent the entire work content of the particular repair and or maintenance in respect of the subject of the Schedule of Rates item and the Contractor is deemed to have included in his percentage adjustment for all ancillary items not specifically referred to in the Schedule of Rates item but are necessary to achieve the particular repair or maintenance of the Schedule of Rates subject.

For items that need clarification, you should refer enquiries via the subscriber.