When at your local plumbers merchant, ask about the heatproof mats they sell. Only a few quid and used to cover stuff that you do not want to burn when heating nearby copper.
La-Co Cool Gel, £9.99 from wickes. Spray it onto the copper pipe down by the push fit, and you'll be fine, but just make sure you don't get any on the part you're soldering, or you'll never get the joint done.
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