One of the country's leading centres of cancer treatment, Mount Vernon Hospital in Northwood, is about to introduce two new machines which fight the disease.
They're called "linear accelerators" and they allow more patients to be treated with precise doses of radiotherapy.
Liz Wickham reports.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.