Quick question

So, we have an ancient iron. I think it’s 1960s, which is not totally ancient, but is pretty old as far as consumer electricals go. We also have a 30mA RCD. This, it turns out, is not a combination that leads to joy.

Anyone with better electronics knowledge than me have any suggestions as to how to stop our beloved iron (which I love because it just works and works and works, not like this modern crap) from tripping the RCD most times that we use it? It usually only does it once, or maybe twice, but we didn’t notice today and thus left the house (most importantly, the fridge) without power for 4 hours.