You've planted the magnolia far too near the fence and will have to lift and move it is probably in a frost pocket from the fence and not a happy tree at all. Normally I'd say wait until autumn but in this case suggest moving as soon as possible and keeping well watered for the rest of the year.

I agree, it sounds too close to the fence (fences can stop the rain from reaching the soil, so it gets dry quickly even in heavy rain). I was wondering if the soil is compacted and heavy? You are supposed to add organic matter and compost the area quite deeply before adding a Magnolia. I think that the dicolouration and curling is due to stress of being in heavy, dry soil (or too wet!).

Thank you so much, I have bought some ericaceous compost & repotted the Magnolia in a large pot and moved it to a more sheltered part of the garden facing South. Should I cover it if there is a frost forecast? The Magnolia was given to us when we lost our dearly loved Jack Russell in Feb aged 16yrs, which is why we are desperate to save it (we live in Blandford, Dorset & the soil is very chalky). Would it be alright to leave it in the pot or should we put back into the garden once it has recovered?

Growing a magnolia on chalk soil is almost impossible... Which particular one were you given Grandiflora, Stellata or Susan?

Thank you so much for replying. I have bought some ericaceous compost and repotted it in a large pot in a more sheltered part of the garden facing South. We live in Blandford in Dorset and our soil is very chalky. Should I cover it if a frost is forecast?
The reason we are so desperate to save the tree is that it was given to us by our daughter in law when we lost our dearly loved Jack Russell Terrier in February who was 16 years old

Matties you've posted the same answer twice - could you let me know which magnolia it is please.

Sorry about that, I'm not used to the site yet and thought I was editing when in fact I had already posted it. Anyway down to business!. I don't know which magnolia it is, not having one before, it was bought from M&S and came through the post, my husband planted it but can't remember a label on it. I asked my daughter in law but she doesn't remember not having bought it from a garden centre. I'll have to wait until it flowers before I can find out. Thank you very much for your help. I will send a photograph when it flowers (fingers crossed)