I think we have enough examples to prove that LHBfication doesn't translate to better priority. Something tells me all your hate for SWR is being channeled from somewhere else.
As far as LHBfication is concerned, I'd say the entirety of SWR has been slow to induce LHB trains. I can barely think of 20 LHB trains in SWR, no more. But that's fine because none of the non-LHB trains have lost any priority whatsoever. It's definitely not something worth cribbing about.
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SWR as a zone still reaches tremendous achievements in terms of cleanliness, quality of facilities offered, and punctuality, especially when compared to KR. So I don't really understand the complaints.