[AndyRVTR]

So.. I have a question re conifer trees that I need some advice with..  I had a tree cut down a week or two ago and I'm in the process of building a raised bed approx 4m long x 1.2m wide x 1m high. My question is, can I put the logs in the bottom, then the brash on top of the logs to half way before adding well rotted manure & top soil to the top half. I'm just wondering how it might affect the top soil?

[New shoot]

Conifer needles are acidic, but their effect on soil is debatable. 

There is some RHS advice here.

https://www.rhs.org.uk/advice/profile?pid=979

It is talking about mulch and if you scroll down, there is a paragraph on conifer waste, but the same general principles would apply to what you are proposing to do.  If all your wood waste is buried in a raised bed, you should not have issues.