I don't know who I buy from that would ship to the UK, sorry. If any of those shops do it's probably still cheaper for you to buy locally. You may want to ask that on a UK specific Supra site.
BT's right about the headbolts. None of the Supras used TTY head bolts (Torque To Yield)... In other words they're not tightened until they're at the edge of their elasticity. TTY bolts are only good for one use. If you look through the TSRM you'll find it has the TTY bolts labeled at the beginning of each section. Still, I too I prefer not to rely on 20 year old fasteners. If you're not going with a massive build new Toyota bolts are fine. My personal preference is for studs though.
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