I don't know if you can get them in the UK, but recent robitronic ESCs (Icube: 5T, Speedstar 2: 17T, 12T, 8T) have an optional Lipo cutoff at 2,8V/cell and there are some Protech ESCs too.
A friend of mine uses the Icube and I have two of the speedstar series (8T for 4wd and 12T for 2wd)
Of course a dedicated lipo-saver comes cheaper, but just in case you're looking for a new ESC!
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