What treatments are offered depend on a few things...
Your diagnosis:
You won't be offered focal treatments if you don't have organ confined focal disease.
You won't be offered prostatectomy if you have spread to lymph nodes, and often not for T3 disease.
You won't usually be offered curative treatments if you are Stage 4.
Your age or expected longevity or state of health:
You won't be offered prostatectomy if you're over an age limit (typically 70-75) or have a life expectancy of < 10 years, or a BMI exceeding a limit (typically 30-35).
You might not be offered radiotherapy if you are a young patient and other options are viable.
You might not be offered external beam radiotherapy if you have serious bowl issues.
You might not be offered treatment if you have other conditions which mean your life expectancy is shorter than the period before you might get problems from prostate cancer if left untreated.
Previous treatments:
You might not be offered prostatectomy if you've had previous pelvic surgery or radiotherapy.
You might not be offered radiotherapy if you've had previous pelvic radiotherapy.
Treatments available:
You probably won't be offered treatments the hospital doesn't do, because they won't have anyone on the MDT to say you would be suitable for that treatment. All hospitals will offer prostatectomy or radiotherapy though, if necessary through another hospital and having their consultants on the MDT. Focal therapies are less likely to be offered, because few MDTs will have anyone with any focal therapy expertise. To a lesser extent, the same goes for brachytherapy.
It you are interested in a treatment not offered because they don't do it, ask about being referred elsewhere, and be careful about accepting advice from those not expert in it.
In spite of this, sometimes people aren't offered treatments which are not obviously unsuitable, so it's always worth checking why you haven't been offered a treatment if you're interested in it.