Aluminium Welding - closer to Edinburgh the better!

Now then,

I have made myself a set of flanges like so:



And would like to get them welded onto the manifold, like this:



The end product will hopefully be this:



The flanges are 8mm aluminium, the manifold is cast aluminium. I've also skimmed the mounting faces of the manifold, so the flanges sit flush against it. I'll make up a jig to hold the flanges in the appropriate positions, so they can be tacked on easily - the only problem is I can't find anywhere to do it (I suspect this is down to me trying to describe the problem over the phone - I'll try some places in person when I have more free time).

If anyone has any recommendations of where to try, or even the skills / equipment to do it themselves, I would massively grateful.

Cheers,
Joey