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If it has leaked that will be trickier than a simple fix unrelated to gas normally.
One thing you can do is put a die in the system to work out where the leak is coming from. E.g. quick google found this kit on eBay (not recommending this one):
https://www.ebay.co.uk/itm/UV-Dye-Torch-Kit-Ultra-Violet-Leak-Detection-Dye-For-Car-Air-Conditioning-RLD1-/260924844698
Fox
thanks.. i will give it a go, its an old micra and they seem to be pretty serviceable, i have time on my hands!