Can you pay half cash half club card points at Tesco direct?

No, Tesco club card points can not be used toward your shopping bill, you must wait for Tesco to convert the points into vouchers, Tesco usually send out the vouchers once every three months (if you have at least 100 points on your card) you can then use the vouchers toward your in store shopping bill or on Tesco direct, if the value of your vouchers is high enough you can pay 100% of the cost of your purchase.