Don't bother.
First up, if you have any latent heart problems they will almost certainly have shown themselves through other symptoms by now, and an ECG is quick and free from the NHS if necessary.
Secondly, everyone is different and it's not at all unusual for a routine ECG to "pick something up". While the machines can identify abnormalities in the rhythm, many lie within acceptable boundaries and you need a cardiac expert to give a clear answer. In the overwhelming majority of cases, this is "it's perfectly normal". So you're actually far more likely to give yourself needless worry.
Finally, I don't know if these tests include a chest x-ray, but (and it's been a while since I did the statistics on this) there is absolutely no way that I would voluntarily have an on-spec chest x-ray unless there was an excellent reason behind it. Do not take the radiation dose from chest x-rays lightly.
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