Help needed with ericaceous soil for raised bed

Hi, first post here, and my first garden so bear with me if I ramble!
The garden that came with our house was just a neglected patch of lawn, which we've had landscaped and is now a blank canvas. At the bottom of the garden is a large, timber raised bed approx 2.5m x 1m and 400mm in height. We hadn't discussed soil with the landscapers so they just filled it about three quarters full with generic compost and I think there's a bit of soil from elsewhere chucked in the bottom too (most likely neutral, though I haven't actually tested it).
Our plan with the planter is to have a kind of woodland display, the main feature being a Japanese Maple along with ferns, hostas, bluebells etc (it's a shady corner so should suit these plants). It appears that slightly acidic soil would be best for this but I'm going round in circles trying to work out what would be best to buy and where to get it from. (I can empty the compost out and use it for potting instead if necessary).
I'm in Scotland where ericaceous soils seems hard to come buy. I've found ericaceous topsoil for sale from places like Norfolk, which seems a bit excessive for delivery. If I buy a neutral sandy loam and blend it with a load of ericaceous compost, will that do the job, or is it essential that I start with an acidic soil? Suggestions welcome, I just want to be sure I'm filling it with the right stuff before I start buying any plants.
The garden that came with our house was just a neglected patch of lawn, which we've had landscaped and is now a blank canvas. At the bottom of the garden is a large, timber raised bed approx 2.5m x 1m and 400mm in height. We hadn't discussed soil with the landscapers so they just filled it about three quarters full with generic compost and I think there's a bit of soil from elsewhere chucked in the bottom too (most likely neutral, though I haven't actually tested it).
Our plan with the planter is to have a kind of woodland display, the main feature being a Japanese Maple along with ferns, hostas, bluebells etc (it's a shady corner so should suit these plants). It appears that slightly acidic soil would be best for this but I'm going round in circles trying to work out what would be best to buy and where to get it from. (I can empty the compost out and use it for potting instead if necessary).
I'm in Scotland where ericaceous soils seems hard to come buy. I've found ericaceous topsoil for sale from places like Norfolk, which seems a bit excessive for delivery. If I buy a neutral sandy loam and blend it with a load of ericaceous compost, will that do the job, or is it essential that I start with an acidic soil? Suggestions welcome, I just want to be sure I'm filling it with the right stuff before I start buying any plants.
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I think the best thing to do is buy a soil testing kit. You can get them in most garden centres and It would be much cheaper than ordering soil. I am in Scotland and my soil is neutral/acidic so yours might be too. If not, then maybe change your vision to something that likes alkaline soil.
This is all new to me and I've looked at so many soil sellers websites and different articles etc that my brain is overloaded with conflicting information! I found a good website called Garden Solutions who seem to have a good load of things I could add in there, so I've emailed them to see if they can recommend what to order to fill it up.
I think if I'd just planted stuff in the generic compost the builders put in it wouldn't really work, the important thing is probably that I get some loam in there too.
What variety of acer are you looking at ?
Just fill your raised bed up with mainly with top soil ( bought or home soil pending PH ) and add compost / manure to help retain moister. Buy a bag pf ericaceous compost and mulch around the acers with that, you can also fed with eriaceous feed in spring and a few weeks before they start getting their autumn colours