We used to be able to swipe up to £25. Swiping through the Avantix machine was disabled a while ago now though so we have to use the Thyron which will only accept swiping of foreign cards without a chip. Otherwise for transactions up to £100 we are allowed to force the Theron to accept the payment as long as the pin is right. This is apparently because we were being fined regularly for failing for work to the card security procedures with swiping when payments declined when they came to collect funds.