From the "Myth Buster" feature featuring Reliants in the current edition of Classic Car Weekly (26/6/2018, No. 1443): "The Bond firm was a big rival".
The article goes on to show that this assertion was false. Reliant (15,000 vehicles per annum produced by 1,600 employees) bought the liquidated Bond company (1,500/300) early in 1969 in the hope of getting its cars into Triumph (four-wheeler) dealerships using the agreement Bond had arranged for its Equipe model (again a four-wheeler). However, this was scuppered when Triumph joined BL, which led to Reliant building the Bond Bug instead.
My dad drove a Gordon (manufactured by Vernon's Football Pools!) and two Bonds before wisely opting for the far superior Reliant Regal 3/25, which never broke down IIRC. None of these four 3-wheelers, I feel, would've appealed to the divine Ms. Gardner enough for her to appear in advertisements for them. As far as cars were concerned, Caron preferred the Hillman Imp: