With branding and full brand guidelines already designed by my colleague, along with a set of printed material, I was able to translate these into a full set of web page mock ups using Sketch. These were then presented to the client by the company director and our partner marketing agency via InVision, allowing for comments and feedback and various iterations.
I now maintain the site, adding news items and creating on-brand graphics, wireframing, designing mockups and then building out various new aspects of the site, for example the Best Practice Guidelines page where various PDF documents, that I have also created, are now available in translated languages via clickable modal boxes.