Is anyone able to advise me on how could I fill in the gap between the outside edges of the two Circles and connect them to the rest of the model
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Found a way to do it, scale out the top of the circle select the vertices from 10 to 2 o'clock then S Y 0 then extrude the straight edge to the adjacent edge of the mesh.
Repeat for the Vertices from 8 to 4 O'clock locations.
Add Loop cuts and joining up the vertices using the magnet tool, select all and press W and click on remove doubles.