It is a good idea, but the charges a high.
The Duty charges they charge for the 'free' membership is: 27.5% of the parcels value.
Then add the shipping costs which for the 'free' membership is as follows:
1 kg £39.10
2 kg £44.20
3 kg £50.30
4 kg £54.40
5 kg £58.50
6 kg £65.60
7 kg £69.70
8 kg £73.80
9 kg £77.90
10 kg £82.00
11 kg £86.10
12 kg £91.20
13 kg £96.30
14 kg £101.40
15 kg £106.50