Yep - I was close enough

Perhaps the prepaid Mastercard changed (£10 more now?) as the effective cost is £10 less total across 24 months.

Worth mentioning you can also get Plusnet 300 and Plusnet 500 faster speeds for very little extra per month if you scroll down past the Plusnet 150 price.

TLDR prices are changing all the time but if you are a new customer and are around £20 effective cost per month I class that as a great deal for 150/30! At renewal you can usually match the then current monthly offer price (e.g. £22.99/month) with a bit of persuasion but they generally do NOT give the prepaid Mastercard. YMMV