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I had mine done at Mill Lane but they also serviced it and told me I hadn't got PPP and that all four tyres were shagged (which they weren't) so take your pick...
Try Protyre Bath Road in Slough (Tel 01753 571171). They have the latest 4 wheel laser equipment with print-out and will probably sort it while you wait.
Failing that, take a drive either of my centres at Bristol (Tel 0117 9450123) or Gloucester (Tel 01452 505588). Same equipment as Micheldever - no waiting and better coffee!!