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Hmm, possibly a bit of a high number for a Grubb -
This 1972 model has number 22903 - so they'd need to have been pretty busy to have ever reached 35308...
https://www.flickr.com/photos/jwright/sets/72157594494503134/We're probably barking up the right tree with Holdsworth-group though...
Claud Butler might be worth looking into, they did curved brake bridges & 5-digit serial numbers...
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https://www.lfgss.com/conversations/174118/
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https://www.lfgss.com/conversations/207028/probably a precursor to the mistral which had the same fork crown and lug set but with the wrap-over seat steay. Thanks RVL !
35308 on bottom bracket shell underside, parallel to the spindle