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You pretty much have it covered, however you could try ASK.co.uk in-house PPC deal, and Looksmart do a PPC deal.
Also depending what industry you are in, you could try Dealtime and Kelkoo who also do PPC deals.
as for results, the above are all pretty good, but have not personally tried Dealtime or Kelkoo.
ASK.co.uk is super conversion rate in B2C markets.
Shak
Mirago is a junior player in the UK market, but still worth a look. They have recently improved their search facilities and are promoting the engine heavily. They also now provide results to a small number of other sites.
Limey Search - [limeysearch.co.uk...]
Limey Search carries an in-house PPC scheme, which is also used for the significantly more popular Abrexa, although most of the PPC results are from Espotting.
Search2 - [search2.co.uk...]
As far as I can see, Search2 doesn't have any partner sites - the PPC results are only used for its own engine.
Splut - [splut.com...]
Like Search2, Splut only powers its own search results.
Webfinder - [webfinder.com...]
PPC offering from Thomson Local. The top results for any keyphrase will appear within the top three results on Freeserve.