According to https://www.measuringworth.com/ukcompare/relativevalue.
£1 in 1971 is equivalent to £21.30 in 2015 if we take into account average wages
£1 = 240 x 1d (old money) so 1d is equivalent to 2130p divided by 240 = 8.875p (call it 9p)
So 1d in 1971 = 9p now.
In which case (if my maths is correct) the sticks are just over twice as expensive. But I'm not entirely sure my maths is correct!!
I'm sure I haven't got this right...