The Skylark 3 at the GSA Wessex club in 1961 (Andover, Andy Gough CFI before he went to Bicester) was plain aluminium doped. I'm pretty sure it did get a red/cream colour scheme before being sold when the GSA bought a few Oly 463s in 1963. I don't know its GSA number, Al Stacey or Ian Mcfadyen may have records.