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Have a few packets of these that I got from homebase. There are a few different max widths more than the 5mm shown.
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Yes, they are the bollocks. My garden fence is attached with those (the big hex-head bolt type) and it's held up for a couple of years with no issues. They have the advantage of not exerting outward force on the bricks/blocks. Perhaps it's not so easy to just drill straight through the wood and into the block/brick as you would for a frame fixing, but I prefer them.
are masonry screws any cop? seems a bit easier than dicking about with rawl plugs. it's to fix a long wooden batten to a blockwork wall.