Phal leaves pitted and some small brown hard blisters

[byngga]

Hello - It's my first post here, but I have hovered around and read the forum many times over the last year (since someone bought me my first orchid ) Have gained so many tips - So first let me say a big thanks!!
I have a little experience in houseplants but usually stick to the easier varieties... so an orchid is something of a challenge as we live in an old victorian house which (while comfortably heated) is not quite 'tropical'. Lots of experience in vegetables but that's a whole other story.

So, I'm concerned about my Phal which I've had for almost a year. Somebody bought me this as a gift in simmer 2013, so it's quite sentimental to me. It flowered lovely all summer and has put out a new flower spike almost as soon as the old one was finished. I'm just a little worried about the leaves - I'm seeing a fair few spots and a 'pitted/scarred' area which seems to be affecting the top oldest / biggest leaves and getting worse.... the newer smaller leaves don't look too healthy either - one is curled.
Probably best if you check out the pics.

Thanks for any help.