Issue with new build

I'd be looking at the planning application. Has the development been built in accordance with all the approved plans? Have all the details subject to conditions (particularly drainage) been approved? Is the development in accordance with the approved details?

If not then speak to the council's planning enforcement team.
 
Would the environment agency be part of the council?

Check the flood maps on here https://www.gov.uk/check-flood-risk I know in Scotland (through SEPA) you can check which areas are prone to flooding (surface water). Should be able to do the same through the link. Depending on what was there before (may have been prone to flooding previously) the building of the houses may have increased the problem or created a problem as shown by your images. As mentioned previously, if there was a drainage ditch previously that they have filled in rather than maintained (possibly piped underground) on land they don't own but have still dumped on then the issue would lie with the builder / drainage engineer associated with the development. If you can find out who owns the bit of land they've used (look back at the original application as it may have the original farmer), they could possibly be contacted as an issue which could affect you and your neighbours due to the builder's attitude, could land at his door which I'm sure they wouldn't want.
 
A quick update.
I have provided the developer with photos of the house in-build.
These photos show that as the house progresses they have filled in the drainage ditch,which was in the same place as the tapering land in the second photo in the OP. The ditch is outside the boundary i.e. in on the other side of the fence.
My current stance is that as the field is not theirs then why have they filled in the ditch? Albeit the ditch is small, but this is proof of that they have made a pigs ear of land they do not own.

I am awaiting a response from them on the above.
 
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