This is a UK patent, the USPTO has no jurisdiction over it.
In the UK, there is an administrative "reexamination" process that is significantly cheaper... only 250 UKP: https://www.gov.uk/government/publications/request-for-opini...
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In the UK, there is an administrative "reexamination" process that is significantly cheaper... only 250 UKP: https://www.gov.uk/government/publications/request-for-opini...