I've ordered several wills of other people in the past but can't find Winifred... very odd!
I'm not clear from this response whether you mean that you have submitted an order on the HMCTS website using the information contained in the calendar, and had the order returned as unfound, or something else. If it is the former, then that suggests the will may not be availbale in the UK, perhaps due to the resealing in Kenya. In my experience the IronMountain staff who deal with normal orders don't understand the resealing process, and you will probably need to take up your case with the probate registry staff, using this link:
https://www.find-court-tribunal.service.gov.uk/courts/newcastle-district-probate-registry Don't expect this to be a simple experience. You will need to complete a PA15 form and submit it along with the current fee (it was £1.50 in February 2024 but may have gone up in line with the standard ordering service) and a search fee (£3 in 2024) to the Newcastle office of the Probate service (address will be given to you along with a copy of the form when you first contact them).
I had to follow this process in 2024 for a will which had been proved in Barbados and resealed in London.