Ok after saying it was going to do this over a month ago I finally got around to it.

From my side I scraped the solder mask on the right side of the usb port away so that I could run a bead of solder along the side of the usb port. Secret here is to use a blade on the soldermask and very gently scrape away - rather use 100 light scrapes and slowly remove the mask then doing it on one or two scrapes and risk removing the coper layer. The left side of the usb port was too inaccessable to try get a soldering tip in without risking melting the ribon cable going up to the board above the usb port.

I then decided to add epoxy too - on the left of the usb port and aboveit. I used JB Quick since it sets nice and fast. To prevent any epoxy from going into the usb port I get a existing usb cable and sprayed some WD40 onto it and put this into the socket. The idea here is that if any epoxy does get through the gaps in the usb port, the epoxy will not stick to the plug because of the wd40. I left the plug in for about 4 minutes (jb weld was nearly set by then).

Phone is reassembled and working 100% - hopefully this will give me piece of mind when plugging it into the charger. As someone who bought my phone from an importer in Australia I doubt I have a warranty anyway.