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I've found something that looks like it may do the job, ordered from Amazon and I will update this when I know more!
Link below for those interested, but I obviously can't gurantee it works.
Well I have ordered this ,so fingers crossed
I ordered this, which worked.
I have the Trackisafe and the Vodafone Curve for my dogs.
This charging cable worked for me for both trackers: https://www.ebay.co.uk/itm/203804537182
They seem to be the same connection, 4-pins. Strong and good quality replacement.
Very fast shipping too. Hope that helps someone.