The best replacement for sipp is isa.

The best alternatives to sipp are rated as following:
★★★★★  isa
★★★★★  ssas
★★★★  stakeholder
★★★  qrops
★★★  company pension
★★★  personal pension
★★  avc
★★  annuity
★  personal pension plan
★  sass
★  stocks and shares isa
  nhs pension
  stakeholder pension

Your alternative for sipp is not listed? Suggest!
Speaking about sipp, one probably shouldn't forget about tls.

Other search terms related to sipp and their ratings are:
★★★★★ tls
You have in mind a companion for sipp and it is not yet here? Propose!



Google Trends

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sipp
isa
ssas