The low tyre pressure warning panel illuminated and the left hand front tyre pressure was flashing at 31 / 32 psi. All tyres were on the low-side so I inflated all to the correct pressure. With the correct 36 psi - the warning panel was still illuminated and the 36psi reading in the left front tyre was flashing. Even after driving a fair distance and switching the engine off / on - the warning remained illuminated. I then inflated the problem tyre to around 39 psi - and checked that this registered on the display. After switching the ignition off then on - the warning panel extinguished. I reset the tyre to the correct pressure and the warning panel has remained extinguished since. I've had other cars where simply correcting tyre pressure has extinguished the warning but I have read about owners needing to disconnect the battery to reset the TPMS on some cars. The Ignis handbook makes no mention of any special procedure for resetting the TPMS.