Can anyone identify the correct plug for this socket?
Those are 6.3mm tabs, for mains voltage and around a 10A load.
Many thanks!
This looks very similar to the mate for TE 521204-1 they have different options for the tabs in the datasheet. You would need to measure row spacing and tab spacing to verify. Here is a link to the drawing.
Having dived back into the appliance to retrieve the plug (I cheated!) I found that was labelled "94550", which led to the Molex 94550-4202.
Thanks all
That looks like a pair of Faston tab terminals. If they are the proper thickness, there will be a matching connector similar to those shown below that will fit. If they are not connected together, they may be suitable for a connector that has an overall insulating cover.
Wikipedia FASTON terminal article