Sent my SVA Application forms to VOSA on Monday by recorded delivery and they were signed for on Tuesday. Quite a lot of paperwork required including the SVA form itself, the Amateur Built Declaration, receipts to support the ABD and a bunch of photos to prove that I built it myself.
Deadline for SVA applications is 28th February, after that the new IVA scheme will come into effect. Last date for the actual SVA test itself is 28th April. Apparently if you fail the SVA test you can get a retest up to 6 months after the initial test and still be tested under the SVA rules.