Lady Catherine Sarah Percy (formerly Valentine; born 23 June 1982) is an English gunsmith and mechanic.
[4] She was chief mechanic for Marquass Motorcycles, appointed by company founder Ben Whately.
[5][6][7][8] After working as a mechanic she trained with James Purdey & Sons, the royal gunmakers, and set up her own business making stocks for sporting guns.
[9][10] On 26 February 2011 Percy married Patrick Valentine at St Michael's Church, Alnwick.
[13][14] A man named Michael McNamara sent letters to Percy prior to her wedding, allegedly threatening to crash the ceremony.