Flow temperatures

If the flow/return temps dT just before the boiler are 10C to 12C and only 7C in the boiler then there must be a internal bypass open?.
 
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I'm going off the menu system in WB showing about 7c difference (sometimes less). All rads (even the towel rail) are balanced to around 10 to 12c difference. Internal bypass is something that I don't know anything about though John, not even sure if my WB Si Compact (2014) has one or even is it something a householder, like me, can alter?

On another note, am I actually doing right at achieving a Delta of 10 to 12 c at the rads, would I be better going for something like 5 to 8 c difference thus giving me a higher mean temperature and obviously higher rad output and then able to use lower flow temps with reasonable heat up times?

EDIT : just looked at the manual and indeed it has an internal bypass.
 
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