Proton Beam Therapy to be made available on the NHS to all Cancer Patients

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I didn't even know what proton beam therapy was until recently. It all started when my niece Natasha was diagnosed in 2016 with a brain tumour, and in March 2018 she had surgery to remove a tomato-sized tumour. In October 2018, Natasha now learned that not only has the cancer returned, the tumour has regrown to its original size… in just three months, and has been told by her NHS specialists that chemotherapy and radiotherapy represent the ‘only hope’ of prolonging her life. However, my niece is terrified of the side-effects of the traditional treatments. 
In March 2018 Natasha had surgery to try and remove the tumour - while she was fully awake during the operation, the procedure was 80% successful. Three months down the line, Natasha was told the devastating news that not only had her cancer returned, the tumour is as big as it was before and was told chemotherapy and radiotherapy were her last hope for shrinking the tumour and extending her life. 
But Natasha, is concerned about the harmful side-effects of chemotherapy, and worried traditional radiotherapy could damage tissue surrounding the tumour, causing secondary cancers in the long term. 
Instead she sought-out proton beam therapy - a treatment that’s been surrounded by controversy in the UK. 
Unlike traditional radiotherapy - such as intensity modulated radiotherapy (IMRT) - proton therapy uses an accelerated ‘pencil beam’ of positively-charged particles, travelling at 100,000 miles per hour, and which is said to target the area with pin-point accuracy.
While x-rays pass all the way through the body, damaging sensitive tissues around and behind the tumour site, proton beam therapy particles stop at the tumour, reducing collateral damage. 

Why are patients not consulted with the option of having proton beam treatment? This should not be excluded from their treatment option. Why is the NHS not offering this treatment?