Like I said to you you'll struggle to get many 400's to Llandow, it's not the best track and it's a flippin' long way.

You'd have a lot more luck somewhere like Cadwell, there's always an "official" 400Greybike day, normally just a hijacked day at Cadwell, the tyre bloke is never pleased to see 40+ 400's running tyres he doesn't stock!

You should all be aware of course there are several properly fast riders on the forum (boys and girls), sub 1.50 round Cadwell, sub 55 round Brands Indy type quick.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread