Thanks guys, I tried the Bitmain accelerator, but it's been over a week now and no joy.  This is the transaction in question:

https://blockchain.info/tx/5bf21258c3aa30abb5e56ed34de8ed1c8c42537b628ea54a6a50893dd752b217

I don't mind waiting a few more weeks, just worried it might never confirm or something if so I'll overwrite it.