@PEG
Hi,
Thank you so much for the detailed advice - & you are right - I am astounded at how utterly clever & devious these critter rats are - it seems no matter where in the world - they always find a way to penetrate defences.
Unfortunately, when the drain folks put a camera down the drain pipes which branch off to our house, they found that the nearest one to the interceptor was badly broken & collapsed. Apparently, the rats travelled down this broken pipe, dug thee way through the remaining soil & then through the house wall as shown in the previous pics. From there, they went into the room which has concrete floor, turning right & eating through the concrete (about 1 metre length) until they reached the main house which is rested on wooden beams - see pics!
When the drain people came, we saw the critters coming from the main drains & going into/out of the ones that lead to our house - buggers did not go down the run that feeds into our neighbours house - only ours!
I cannot understand how there is a sub-floor space in the area they made that large hole - I was there when it was built & the buildings inspector came round to pass & inspect (he did so 4 times) & the solid foundations were built down to a depth of 1.2 metres & only then did he pass it. I am very confused about this - how can there be a cavity?
Behind the room broken into, there is a disabled bathroom which has a toilet - behind this a vent stack for the loo which has been boxed in but sadly, they made their way into that as well - they have even managed to get into the roof cavity of the conservatory between the ceiling plasterboard & exterior
tiles - all the way at the back of the house!!
The area is pretty well maintained & no real food opportunities outside - many residents of our road have cats & they are roaming about pretty much all day & night & have been doing so for decades! I have never once seen a rat at surface level!
Unfortunately, with allergies & sensitivities that other members of the house have, I cannot have a cat or other animals in the house otherwise I would have done so long ago!!
I often wonder, why is an animal that is so very smart does not think, there must be a better way of living & eating than trawling through sewers & all that nasty waste to get a meal - their cousins the squirrels seem to manage it!
Will keep you updated!
Bazzzy!