Technically Vega64 launched at £449 tbf, it just lasted about 5 minutes, literally, before it sold out, then it was hundreds above MSRP within days due to cryptomining & the like. A Vega-7nm with HBM2, at least a lower bin, could easily target £300-£400, with Navi coming later as an across-the-stack replacement, the question is whether they really need Vega2 to fill the ~6 month gap when their replacement will be faster, cheaper, & better timed. NVidia is caught up in their largest stock crash in their history iirc right now as a result of misjudging their own moves in the £200-£400 bracket and jumping the gun on a replacement, AMD just needs to avoid making the same mistakes. All of AMDs success the last year or two has been from refusing to be pressured or rushed into risky decisions, everything has been planned long in advance and every decision they've taken has been to minimise risk, & safely(Not quickly) rebuild their margins.