Rather embarrassingly, I can't remember the specification, but it's not high by modern standards.
it's a Core i3, 2GB RAM and a 320GB HDD but I could be wrong (might be a Core2Duo, and might
be 4GB). Again, I think it's from around 2009 (black back).
It is a model where the RAM can be upgraded if you can find the right SODIMMs, although unless you have any lying around they're disproportionately expensive as it won't take current units. I should have noted all this before wiping the drive; didn't realise it wouldn't reinstall the OS from the recovery partition, but would want an Apple ID to reinstall, which rather defeats the point of wiping the drive if I then tie it back to myself ...
Works absolutely fine, albeit patience is required. Was running El Capitan prior to disk format this weekend.
If you want it but have trust issues, I'll set up a disposable Apple ID to get the OS back on, or you can come and have a coffee here whilst it installs against your Apple ID.£50
- Collection from Hertford or meet up by mutual convenience, really - not feasible to ship it.