GoodnessKnows, what a shock.
It's probably helpful to know that tumours aren't as clear cut as 'benign' or 'cancerous'.
You can get 'cancerous' tumours (malignant) which are so slow growing that actually, most patients die of old age before the cancer 'gets' them. A notable example is prostate cancer in men - if a man is of a certain age when diagnosed, they are often offered 'watch and wait' rather than active treatment.
You can get 'cancerous' tumours (malignant) that are either massively rapid in growth or very invasive and the tumour itself causes decline in the person.
You can get 'benign' tumours which are in big body spaces and merely cause discomfort or pain, but have no real effect on the health of a person. For instance, growths in the abdominal cavity which has quite a lot of space around it.
You can also get 'benign' tumours which aren't cancerous, but because of their location they can cause problems or even death in a person. Tumours in confined spaces, especially the brain, can be very problematic because there simply isn't the space to spare for anything 'extra' and the brain gets crushed by the tumour.
In your case, if the tumour is in your spine, then the fact that it is benign isn't the only consideration. It may need treatment to reduce or remove it, to prevent further problems.
I know someone who has been treated recently and Stanmore and they seem happy with their care.