Morgan? McLaren? Ginetta? Caterham?
Most of these use proprietary engines, CV joints, brake calipers etc, some of which will be UK designed/made, some may be made elsewhere.
Many F1 cars are designed and built here with unique in-house parts, some items (e.g. spark plugs) will be bought in from specialist manufacturers who may be foreign, it's not cost/time effective to design, develop and test such things if what you need is readily available. Tyres are another item for which tyre makers expertise may as well be taken advantage.
I doubt if there has been a 100% designed and 100% home manufactured British car for several decades.
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