Welcome back to the world of bikes!

Since you already have a decent road bike you should consider updating it to fit your current abilities, if possible. A few photos of the bike would help with an assessment of what could be done. You might be able to save some $ by updating vs. buying new - depends upon what's needed.

If you're Holdsworth simply isn't going to work, then Craigslist is a possibility - lots of good bikes for reasonable prices - but that's premature - post some pics.`

If you haven't posted pics before just make sure you shrink them down to small before trying to upload or it won't work well.