Model and Allied Publications (MAP) and Aviation News used to have the plans Jan, but far as I know, they've gone - haven't been able to find any mention of them for ages. The SAMI Lightning book has plans you can enlarge to 1/48th scale, and I have some fairly basic scale drawings of the Canberra and Buc you could enlarge. The true percentage, from 1/72nd scale to 1/48th, is 150.1%, but photocopiers use a different ratio.
That article on the TSR2 I mentioned might have a plan, can't recall, but I haven't found the magazine yet!!
You could make rough plans by drawing around the kit parts, which might be suitable for laying out the cammo patterns?