Maybe Marble Arch would do so yes - plant it somewhere better now and plant it well - watering before, depth, soil improvement and watering and feeding afterwards. Then it can get its feet down happily and you can give it the support it needs as it grows. It will want to get to between 7 and 10 metres so train it well as it does grow.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
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Montana is way too vigorous for that.
Can I get away with it for this spring/summer season, then move it in autumn to somewhere with more space to grow like against the front of the house?
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.