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Heavy rain will eventually come through if it puddles long enough in one spot and the tent nylon isn`t proofed enough (it`s measured and tested by the height of a column of water positioned on a point to see what it will take to force the water through, called the Hydrostatic Head or HH. This is what you see mentioned when buying a tent, usual is around 2000mm HH for an average lower cost tent, could be a bit less, tents with 3000mm HH or more tend to be more expensive due to the better materials and proofing used. Aim for at least 3000mm HH, more if you can afford it for maximum waterproofness).

 Sure it wasn`t condensation forming and running to the lowest point to drip off?

You need to try and re-create the conditions and then examine the roof in detail to see where the water is coming from. If it is seeping through the seams it may be that the heat bonded tape is not quite adhered fully to the stitching. In this case, use seal sealant on the area when it is dry, and allow it 24 hours to dry before putting the tent away.

If the proofing of the fabric has been degraded by UV this often shows up with whitish patches on the inside where the PU coating is starting to come away from the fabric; if you are seeing this then there is little you can do; proofing on the outside will not equal the quality of the original bonded PU surface on the inside. However UV degradation is unlikely after only 2 years of normal usage. So my guess is that it is condensation.

We camped during the recent heavy rain and the weather meant we had to cook inside too; even with mesh windos and doors and every vent open we ended up with a dripping wet roof where the steam met the cold fabric - so we just swabbed it down with an old teatowel.  This is one of the perils of manmade tents and we all need to learn how to manage it; either that or join the ranks of the cotton canvas campers!!