If you want a long read, try this:
assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/631668/An-inspection-of-Border-Force-operations-at-east-coast-seaports.pdf
This is an extract about the problems Border Force have with search technology and equipment:
Border Force makes use of scanners to search suspicious freight, particularly sealed unaccompanied containers. Scanners are incorporated into a lorry and, when activated by the Border Force driver, the scanning mechanism swings out to move over the container.
Border Force officers told inspectors that they were concerned about scanner availability. The Humber scanner is shared between Hull and Immingham and inspectors witnessed an occasion when there was no-one available to drive it to where it was needed. In this case, a Category B target consisted of tyres packed so tightly into a soft-sided trailer that the bulging sides meant it was not safe to open. The officers present wanted to scan the trailer to determine if there were cavities that might conceal prohibited goods. The scanner was elsewhere but not in use, but there was no driver available to move it. The officers instead had to use other, less ideal, technologies and to run checks against the agent, delivery address and driver, before releasing the load.
Border Force officers who hold a driving licence that does not cover driving heavy goods vehicles, such as the scanner lorry, are unable to do so without specialist training.
Officers at one port said that they had lost the majority of their experienced scanner drivers to earlier voluntary exit schemes designed to achieve budget reductions. They had also lost officers with expertise in interpreting the images produced by a scanner. They said that while the basic skills could be taught through training courses, experience was important, particularly for interpreting images.
Border Force told inspectors that it keeps track of how many trained scanner lorry drivers and interpreters it has in each area, and that it had plans to train six more east coast officers to drive the scanner lorries.