You can add the following into the product description:
!!<<p><strike>RRP £20.00</strike></p>>!!
or if adding to each product you could add in a CUSTOMVAR into the Act_productline.html template and set a CSS class to create the strike through, font size, colour etc.
Saw that yesterday but not a user of Sage so can't help - may be worth bumping the tread to the top or if left more than a day one of the Actinic mods will usually help out.
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