Part L1A of UK building regulations stipulate an air permeability of no more than 10m3/hr/m2 of building envelope at 50pa of pressure. My home has approximately a 1:1 ratio of building envelope to volume, though this will vary a great deal. But for such a home this works out to 10ACH at 50pa. There are various studies on how to convert these measurements to natural ventilation rates, but the conversion rate is around 10-30, with the typical house being adjusted by a factor of 20, i.e. 0.5ACH, however this can be as high as 1ACH.
Some homes will be constructed to higher standards, but will not likely achieve less than half this rating.
This also ignores the presence of trickle vents inside windows in homes without mechanical ventilation, and that the majority of homes in the UK were built to lower standards - typical values for homes built prior to 2010 are 15-20m3/hr/m2.
Therefore, 0.5-1ACH is a pretty standard background ventilation rate for homes in the UK. Your typical Passivhaus home with 0.4ACH from mechanical ventilation has less ventilation than a typical home, not more.
Only very large homes built to strict modern standards and with a high interior volume to building envelope ratio could possibly have 3-4x less ventilation.