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Is it standard to capitalize "throughout the Fifties " ?
Yes, unless you're using the digits instead.
It's not immediately clear to me what "Intended for service use," service refers to here-- remember that all work in the armed services can be called "service"
I don't understand "and a time to 25,000 metres (82,000 ft) of only seven minutes." -- if it's just me being dull, feel free to explain here instead of in the article
See if my change makes it any clearer
Any information on the cost of the prototype?
Is it really worth putting the sentence under 'Surviving aircraft' as a bullet point?
MOS:ELLAYOUT recommends accompanying an entry in the 'external links' section with a brief description if it isn't clear what it is