• The first post had a part of the answer, an extra layer of rim tape (on top of the factory fitted) made things a whole lot more snug, plenty of soapy water and a good workout with the track pump and both front and rear popped on without an issue. They are both holding air and no more soap bubbles are appearing. Tried to deflate one to get the sealant in and it popped of the rim on one side. have re-seated and will leave today, go for a quick ride later to see if that helps to finish off the fit before trying with the sealant again.
    Thanks all for your input, would consider myself pretty confident with road tubeless but everyday is a learning day.

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