I got a foundation-class licence a couple of years ago - unfortunately I haven't really had the funds to buy a transceiver (foundation licensees aren't allowed

I got a foundation-class licence a couple of years ago - unfortunately I haven't really had the funds to buy a transceiver (foundation licensees aren't allowed to use home-built equipment) and I let my licence lapse last year. I may reapply for a licence later this year though. Ultimately I'd like to get up to a Standard licence which allows experimentation with data transmission modes - some fun to be had with an appropriately equipped Arduino...