I finally managed to disassemble most of the fryer unfortunately it wasn't the mains fuse or the thermal fuse and seeing all the electronics inside I decided to give up. However, just in case anyone else comes up with a problem on this fryer, I thought I'd post a few pictures on how I did it. It may save someone some time and aggravation.
Top view.
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The display panel is first to be removed. This view gives an idea of the clips underneath.
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The display comes off with the display board attached.
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There are four screw attaching the board to the display. These need separation so the the board can fit through the silver surround.
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This is showing the clips under the silver surround. It is a pain in the whatsit to take off. I only broke one of the clips.
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Having removed the surround I need to remove the board. Just two cables.
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With the board removed the eight screws can be removed. Note the position of the screws as there are four small and four bigger.
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This is where I got to and had to stop as my troubleshooting experience with electronics is lacking.
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From what I had read about air fryers, the usual problem is the drawer switch and this is where I started. This is the bottom view of the fryer and that sole screw is the first thing that has to be removed. I don't know if somebody else had attempted to unscrew it or whether the manufacturer purposely uses a screw for which there is no tool. With great pain I managed it.
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Another six screws to remove.
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Revealing the power cable connection
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Once this is removed, there is access to the drawer swtch
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Good luck.