Looks like you are out of luck on that one:
3.10 No sponge/foam tyres may be used. Foam tyre caps are not allowed but internal foam inserts are permitted.
3.10.1 No additives other than water to be allowed on any tyre.
But it also says: Please Note: BRCA Regional events can run to variations of the following rules :- 3.10, 3.10.1, 3.10.3 ......
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