Thanks guys, other than the blemishes, I'm pleased with how the yellow has gone on. When seen from a distance the marks are not really noticeable, the one on the cab side will be covered in BR blue so I'll gently sand them, I'm worried about making more of a mess so I might just weather the other's out and lesson learned for next time, I've got a few Lima Locos I want to upgrade.
I've read some stuff about using Vinyl masking tape for a clearer line, have you had any experience of that, I've only ever used Tamiya tape more masking?