Think my SP 15mm TA CLD hub was £122 from Spa. Whenever I've tried to make something on a bike do something else it wasn't designed to do by way of a adapter, I always end up disappointed with the results. Wouldn't want your TCR to be finished because of a £12 adapter would you?
"we are aware of a number of products designed to adapt QR15 to the QR12 TA standard including: http://www.notubes.com/Stans-Hub-Conversions-C145.aspx, http://www.hopetech.com/product/axle-conversion-kit/ and http://www.wheelbuilder.com/dt-swiss-axle-conversion-kits.html. We have not tested any of them so cannot guarantee that they will work with the QR15 PD-8X. In terms of PD-8X-M, SP's current forecast for availability is 2017."
http://www.intelligentdesigncycles.com/product/shutter-precision-pd-8x-qr15-hub-dynamo