Lewis, if you can trace your family history back to East London, then the answer is very probably yes! We know that 99% of Helen's rellies hail from there back quite a few generations, places like Poplar and West Ham (Helen was born in Barking [
], grew up in Cambridgeshire, the first known generation of her family not to grow up in London). That obviously doesn't rule out an Australian connection via emigration of your ancestors, maybe the bad egg in the family?
I enjoyed the movie too, sumptuous landscapes and decently faithful to the superb source material. Very believable scenery, though it might've been nice to vary from the Wadi Ram backdrops at some point during his 3000km travels from Acidalia Planitia to Schiaparelli. Matt Damon made a good Mark Watney too. Though as an XKCD What If aficionado, I'd have loved to have seen more of the number-crunching survival experimentation, but for a Hollywood flick it was well done.