You can get away with most light spinning tackle Stuart, anything from an 8-10 ft spinning rod, small spinning reel, maybe 10lb breaking strain line (or use heavier braid), a short nylon/fluoro carbon trace and a few spinners/lures - I seem to do ok with the ABU "krill" ones as they cast well, but any decent lures will work. It's always an idea to put a swivel between the main line and the leader. You can also try similar gear with a float and a strip of sandeel or herring as bait - that can be a bit of fun.
As you're Sheffield based, you'd have to plan a trip pretty well. It might be an idea to look at something like the WorldSeaFishing Forums to see what's around - when there are mackerel about they tend to let everyone know. Still a bit early up here for mackerel, but June/July is more often our starting point from the shore.