Decided to try to replace the latch plate myself after confirming 60mm distance between screw centres. It was not straightforward as the main metal door strip ( see photo) was ONE PIECE running down most of the door and this strip has to come off to remove old plate and replace with new latch plate. However by simply loosening all the screws I was able to lever open the main strip and replace the latch. Now, after a little adustment of positioning, it all works perfectly!! This probably saved me about £60+ THANK YOU GB DIY!!!!!!!!!