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Do u mean equipment as in the modems or the network as a whole?
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The modems. AFAIK neither TW nor ntl are installing DOCSIS 2.0 capable CMTS, but that's in many respects the easy bit, it's replacing hundreds of thousands of CPE that costs, which is why Telewest and original ntl has only DOCSIS levels of speed, while the ex-C&W areas of ntl where we had the foresight to specify dual-standards can accomodate both.
Are you saying that the TW modems such as the Scientific Atlanta Webstar my Mum has is capable of DOCSIS 2.0 operation with a simple firmware upgrade? I don't.
I believe Mum has a DPX100 or DPX110 (installed mid-2003), but the first SA modem capable of DOCSIS 2.0 is the EPC2100 (certified December 2003 and AFAIK not deployed on BY yet, they certainly only have USB drivers for the 100 and 110 on their website). I'd be surprised if BY has the installed user base of DOCSIS 2.0 compliant modems ntl has had since the introduction of the Ambit 200 over a year ago. So I'll stick my neck out and say ntl has more DOCSIS 2.0 compliant devices than BY as of now.
Remember DOCSIS 2.0 requires both enough compliant modems and the head-end equipment replaced, which isn't a trivial job for either firm. BY may get there first owing to having a smaller network and thus less work to do (60% of the size, roughly), but ntl are probably ahead on DOCSIS 2.0 compliance.