Firstly, people want to know what to get you as a wedding gift, I know how you feel, I felt terrible sending out the little card things from our wedding list.
How about something like:
Your presence is the most important thing to us on the day, however, if you want to buy us a gift we would really appreciate some money towards carpets and furniture for our home. Thank you. Sarah and Brian x
Thats not cheeky, just saying what they want to know

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Lady Rools
Vivacity, Playfulness, Honesty, Strength