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I'm mostly worried that it will not seal again. Doesn't look like it's ever been vented that way - at least not since the former owner choose this lovely colour to go with the lavender walls and turquise cupboards...
You should have isolators/taps at the base of the rad, if the top vent fails to seal then isolate the entire rad, pull the vent plug completely and wrap it with tape/sealing gunk and reinstall.
I'm mostly worried that it will not seal again. Doesn't look like it's ever been vented that way - at least not since the former owner choose this lovely colour to go with the lavender walls and turquise cupboards...