I had this offer sent to me by gardeners world magazine as well. I also had to use the link to get the £1 per packet, otherwise it was full price.
I didn't think I needed too much really but still ended up with 40+ packets ordered
£120 basket with over £70 of discount
I'm going to need another seed tin
I suppose there are worse addictions though
and at least it provided some light relief from things at the moment.