Cheers Doddy.
I will stick to the cheap overkill 5V PSU
As you say I will be hitting CPC so will get 4 capacitors there.
Re the transformer the 35V ones I originally selected were 500VA, the ones you suggest are 300VA did you mean to link to this https://airlinktransformers.com/prod...ange-cm0500245 if so then point taken and this will be the one I use.