P38A P38 2.5 Coolant leak

My P38 2.5 Diesel Auto (MY2000) has recently been leaking coolant. Vehicle has still been driving as normal, temperature gauge remains within the ideal zones. After driving coolant was dripping out from under front bumper on the right hand side. Noticed the expansion tank was low (about 1cm worth at the bottom) Topped up with roughly two litres of coolant to bring it back up to the advised level. Did another roughly 30 minutes driving to see how quickly it was losing coolant and it appears that the 2 litres had disappeared and it was back at the low level it was previously.

Initial checks there also appears to be a bit of coolant sat inside the battery tray. Checked engine oil just to be safe and it looks like normal.

Just wondered if anyone had ideas of first places to check.

Thanks in advance

All the hoses and then the rad itself. Given that there's coolant in the battery tray the little hose from the rad to the expansion tank would be worth looking at first.

You can get UV dye to go in the coolant to help track leaks.

Check the overflow pipe from the coolant tank in case it's pressurising and blowing out.

Check the small pipe that goes from the top of the rad to the expansion tank
The cap on the expansion tank can give up as well but then the coolant would run towards the bulkhead