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Do what I did. eBay isopropyl alcohol and some vegetable glycerin. Should cost you less than 10GBP per litre and mix at a 70/30 ratio.

30% glycerol seems very high. The WHO publishes recipes for hand sanitizers with only 1.45% glycerol by volume:

Glycerin is not a very good thickening agent for this purpose, but if it's the only one you're using, you're going to need more than 1.45% of it.