With only £250 a month, you're really just dipping a toe in the water to see what floats. no scaling here, just learning.
Google Shopping can work, but you have to be ruthless. Pick your absolute best sellers - max 3 to 5 products. Set manual CPC bids painfully low, like 10-20 pence a click. Stretch every penny. and your feed has to be flawless: clean titles, top-quality images, correct GTINs (those product codes). Shopping ads live and die on feed quality. one missing attribute and your impressions vanish.
honestly, at that budget I'd split test Shopping against Performance Max for those few products. See which gets you cheaper add-to-carts. PMax can eat budget fast, but if you constrain it tightly, it sometimes finds cheaper conversions.
Also, I've come across this tool called Hoox that's meant to be an autonomous AI - it posts daily articles for SEO, TikTok and Instagram content, YouTube videos for AI search, and monitors social channels 24/7 for relevant conversations. It compounds to build an organic presence. not sure if it'd fit a tiny budget, but could be worth a look if you want to automate content without spending on ads.
What's your current ROAS or cost per purchase looking like across your existing channels? Are you actually profitable on ad spend yet?