Your search for "Effervescent tablet" revealed the following:

Sale price £23.59 Regular price £30.00 Sale
Sale price £33.99 Regular price £40.00 Sale
Sale price £23.15 Regular price £30.00 Sale
Sale price £29.95 Regular price £40.00 Sale
Sale price £22.63 Regular price £30.00 Sale
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Sale price £21.45 Regular price £30.00 Sale