The Freya Plus is one of the few Pre Amps (reasonably priced) that will fulfil my needs.
There were a few minor details that niggled me and as its a keeper I thought I would address these.
To sum up the things that I've done:
Added Socket savers to lift the Tubes out of the case (Cooling)
Added additional vents to the top cover and base to further aid cooling
Fitted taller feet, to match other gear and aid airflow to the new base vents.
Made the volume indicator more legible
Changed the colour of the LED function lamps to Blue (Match other gear)
Changed the Single ended outputs to XLR sockets. (My preference)
I managed to reduce the case temperatures and no doubt the part temperatures, find the whole story on my blog here:
https://www.jkwynn.co.uk/Freya/Freya_03.html