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What is the span of the beam between the supports What is the size of the beam What is the span of the roof between the beam and the inner beam What is the size of the joists supporting the roof and their spacing I assume the roof between the inner beam and outer beam is just a flat bit of roof...

Trumps a builder

And of course if you are Eurocode slanted 1.35 and 1.5 spring to mind

no that would then be 2.24

Factor of Safety

Of course its all down to actual calcs and FoS ,not just this is what we always do, 100, 200, 300, would you fret putting a 10m spanning beam if it had no load on it resting on a 50 x 50 angle bolted to a column??

Whats a G wagon is it like a G string

Yes it can, unfortunately its downstream of the dig zone If he is going to build over their supply pipe he needs to talk to them or do it on the fly

. Indeed not, remove the load and the beam would spring back to its original shape

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All beams deflect under load , 1/360 or 1/300 span is the general max figure used in BS standards but can be tighter depending on the circumstances i.e. say above a glass partition (extreme case). At 10m the deflection could be 33mm which would be unacceptable in your case and hopefully the...

OK just making sure that the supply through the field/your property is WC responsibility and as such you are liable to adhere to whatever conditions they dictate

Possibly due to lintels have a stated SWL and this puts any bearing pressure with the usual specified 150 bearing within the capacity of even soft brickwork and BC know this, not fact ,just an hypotheses.

NHBC state minimum of 100mm but at the end of the day actual bearing should be confirmed by load calculations

Because the local bearing stress does not need to be reduced to an acceptable level by using padstones at a guess?

so where is the boundary box isolation valve located i.e. on your property or before it enters the field

Gosh you have more knowledge about its construction than what the OP has flagged up in post 7

Well he has 2 choices then, point it up and hope it lasts for a few more years or pay some jobbing builder to demolish and rebuild at substantial cost, do you know any?

Another 15 years? , it appears to be strong enough sand to hold the blocks together except where tension forces come into play due to settlement

Well 1 metre of foundation has failed but totally knackered is a bit OTT