Coolant leak advice

I bought my TF160 recently as a damaged repairable, so haven't been able to chat to previous owner for any history.



Fitted stainless underfloor pipes the other day, there was very little coolant to drain when I removed them, I put this down to one of the old pipes having a leak, and the car having sat for about a year before I go it, presumably dripping away. Refilled coolant and bled it out.



I now have a leak from somewhere at the rear right of the block. Looking down, I can see water sitting on a 'shelf' on the block, under where what looks to be the pipe from the expansion tank goes onto the block. I dried it off, ran the engine for a bit tonight, and could see it starting to collect there again. There's a puddle under the car which has appeared since I did the pipes and refilled the coolant, this is what made me notice the leak in the first place.



So, my question to you experts, is there a pipe thereabouts which is common for leaking? Am struggling to be able to see in there easily. when I first saw the puddle, I assumed it would be the water pump, but it would appear not.



Any advice greatfully accepted!

Thanks

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