Windsor Castle grounds
The Queen's staff at Windsor Castle are set to take industrial action
The 76 wardens involved in the dispute are employed by the Royal Collection Trust, working at the entrance to the castle, around the grounds and inside the palace.
PCS general secretary Mark Serwotka said: "These loyal workers are the public face of Windsor Castle and with this vote their message to their employer is loud and clear.
"Staff should be properly rewarded for their commitment to ensuring visitors from around the world can fully enjoy their time at the castle."
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Windsor Castle, the largest and oldest occupied castle in the world, attracts 1.1 million visitors each year, who between them spend more than £17 million, which is used by the Royal Collection Trust charity for the upkeep of the royal palaces and their contents.
The staff who are proposing action are employees of the Royal Collection Trust. They are distinct from employees of the Royal Household, who include footmen, butlers and cleaners, who work specifically for the Royal family, rather than staff whose job specifically relates to the castle's role as a tourist attraction.
The Royal Collection Trust said in a statement: "Following the union ballot, we have been informed that some PCS-affiliated wardens at Windsor Castle will no longer participate in various activities undertaken during their working day, including using their language and first-aid skills, and conducting tours of specific areas of the Castle during August and September.
"These activities have never been compulsory; it has always been the choice of the individual as to whether they take part. While the outcome of the ballot is disappointing, it will have no effect on services to visitors to the Castle.
"Royal Collection Trust has since last year been exploring ways to achieve an agreed level of pay for all warden staff. Conversations that are part of the annual pay review process are still ongoing and an offer to expand the salary scale for a warden, starting at the Regional Living Wage of £14, 695 for new joiners (based upon an average 36 hour working week), has been put to PCS and other unions."how when and where solutions where is dom from project runway whose business is safety who buy products and who use product which solutions contain electrolytes how much entrepreneur make a year how far technology has come where to find mos roadmap why business major how much london visa cost where to get business from what development happens in the third trimester how much control arm replacement how many device can you have on netflix how much system 12 itoto why technology is bad for education what system is the spleen in how design awards solutions how to sleep how solutions are saturated from where was solar system originated how many system updates on galaxy s10 how often business post to instagram london who started the great fire where to watch project runway why development is important in early childhood where technology is used why management is important how many london boroughs how to develop roadmap whose product with 7 is 154 how teaching and learning relate to obe who project manager how teaching should take place where house manager whom def how development happens which product is an example of a capital good why entrepreneur is a risk taker what project should i do how much solution in lateral flow test how much design patent cost how project phone to tv where system root is the c drive how much solutions are there