No gulley head, just a slab on soil with the tortoise. Only one gulley servicing the four pipes. That one gulley was blocked deeper down but retrieved the blockage luckily the water runs freely down now. Here are some more pics.
The drain which services our bath only and kitchen was blocked and overflowed. This could of been for around three to four months. The drain is at the side and half way along the property.
I have successfully unblocked it but I am concerned with the amount of water that has gone into the ground...