Assuming I'm the "Bill" you're referring to, my old filter is a PUR (now Katahdin) hiker weighing 12oz. It has numerous advantages...it includes a carbon filter to remove bad-tasting stuff, both coarse and fine pre-screens, and the ability to collect water from difficult-to-reach places. Heavy, though. I recently bought the Sawyer mini and a CNOC Vecto water bag to use with it. The Sawyer Squeeze reportedly has a greater flow rate, and is still very light.

I this on YouTube, about the HydroBlu Versa Flow filter. Maybe better than the Mini...

https://www.youtube.com/watch?v=QnjYKXn1nFo

Just as cheap and light. Not sure about availability in the UK.
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Always remember that you are absolutely unique, just like everybody else. -Margaret Mead