We spent over £20k on ours but it was completely gutted, boiler moved from one side to another, replastered, tiling on floor and walls plus new oven, cooker, quartz worktop, washing machine, dryer and cabinets (Howdens). We live in S London. Kitchen is medium size, 4.5m x 2.5m.
Not sure I'd use Howdens again, well, it's a small thing, but the heavy use cabinet door has absorbed moisture where it's touched by the fingers and it's bulging a little bit (doesn't show on photos, it's subtle). Apart from that all soft close cabinets are still in good working order. We had it done just under 3 years ago.
Finally, I have an excuse to post my before and after shots
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