Repairing rusty radiator - Plumbing job in Kilburn, North London

Job description

I have a cast iron radiator that has rust around one of the upper screws. It does not currently leak, but it apparently did so quite some time ago. It is quite decayed. I'd like to just repair/repaint it, but I'm not sure it it needs replacement. Advice and assistance would be most appreciated. I have a photo.

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Richard is so helpful and knowledgeable. He was very patient during our initial phone call, as he spent a lot of time chatting with me about the problem and the pros and cons/risks of potential options to try to solve it. I've decided to hold off for now, but I would definitely contact him if/when I'm ready to take action.