Don't do it. Norway's hold their needles poorly. From Top 10 Choices for Christmas Trees, where Norway spruce's were the 10th choice out of 10:

The Norway Spruce is a beautiful tree but does not hold its needles well, and should be purchased just just a week or so before December 25th. The National Christmas Tree Association notes that the "overall color of Norway spruce is fair to excellent, but needle retention is considered poor unless the trees are cut fresh and kept properly watered."

If your inside temperature is low and/or humidity is high, that will slow down needle drop. Since you're in the UK, I'm guessing that you have relatively warm winters (compared to most of the US) and high outside humidity - both of which increase the inside humidity.

Don't do it. Norway's hold their needles poorly. From Top 10 Choices for Christmas Trees, where Norway spruce's were the 10th choice out of 10:

The Norway Spruce is a beautiful tree but does not hold its needles well, and should be purchased just just a week or so before December 25th. The National Christmas Tree Association notes that the "overall color of Norway spruce is fair to excellent, but needle retention is considered poor unless the trees are cut fresh and kept properly watered."

If your inside temperature is low and/or humidity is high, that will slow down needle drop. Since you're in the UK, I'm guessing that you have relatively warm winters (compared to New England) and high outside humidity - both of which increase the inside humidity.

Don't do it. Norway's hold their needles poorly. From Top 10 Choices for Christmas Trees, where Norway spruce's were the 10th choice out of 10:

The Norway Spruce is a beautiful tree but does not hold its needles well, and should be purchased just just a week or so before December 25th. The National Christmas Tree Association notes that the "overall color of Norway spruce is fair to excellent, but needle retention is considered poor unless the trees are cut fresh and kept properly watered."

Don't do it. Norway's hold their needles poorly. From Top 10 Choices for Christmas Trees, where Norway spruce's were the 10th choice out of 10:

The Norway Spruce is a beautiful tree but does not hold its needles well, and should be purchased just just a week or so before December 25th. The National Christmas Tree Association notes that the "overall color of Norway spruce is fair to excellent, but needle retention is considered poor unless the trees are cut fresh and kept properly watered."

If your inside temperature is low and/or humidity is high, that will slow down needle drop. Since you're in the UK, I'm guessing that you have relatively warm winters (compared to most of the US) and high outside humidity - both of which increase the inside humidity.