I had thought of having it milled as i presume this would be how they were done from new, we have a machine shop at our place but the lathes are about 90feet long
dunno if they could do something as small as my lathe bed 
Cheers, John 
Traditionally, good quality lathe beds would be planed, and then hand scraped, never milled. This was considered the only way to ensure sufficient accuracy, even on a small lathe.
Nowadays, most far-eastern machines are finished on CNC surface grinders. Fast, economical and perfectly good enough for most purposes. I think Myford still scrape their beds in by hand. A fact that's reflected in their prices.

There are firms that will surface grind a lathe bed for you. Depending on how much damage or innacuracy you need removed, this can involve removing quite a bit of metal. If the headstock sits on the ground bedways, (like Boxford, Southbend etc) then it's no problem. If not then you will have to shim up the tailstock to maintain the centre height alignment.
one_rod.