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will do some sanding/filling and throw some paint on top.
That's probably the sensible route as the small section pictured looks reasonably neat except for a few marks. Wired glass is fairly fragile, as the wire actually weakens it compared to clear glass. It's not a security feature, but the wire does hold it together if there's a fire.
Unless you were planning to replace the glass with clear, patterned or laminated security glass, leave the putty mostly alone.
If the putty is firm, a sharp blade, or a coarse file if its concrete hard can take off the high spots.
Nice one. It’s very old and the window is 2x3m made up of 9 panels so f*ck redoing it after the small amount of reading I have done on the subject. will do some sanding/filling and throw some paint on top.