Was looking for a cheap PAYG tariff. ASDA mobile is 8p/min anytime any network.
Also, current offer includes £10 when £5 Sim card is bought. Was uneasy about the recent offer of £10 free for a 99p simcard, so this appears to be a safer deal for a basic simcard.
NB. Was initially Asda mobile not Tesco, but unable to change image.