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I don't know anything about that specific model. I support the HP business lines, EliteBook, EliteDesk, ZBook, and Workstation Z.
For the money you're getting a refurbished machine with a 12 month warranty. If you have issues they will probably be covered under the warranty.
My two concerns would be that the drive is only 128 GB and it has 4GB of RAM. Both of these are half of what I'd recommend. Here is an idea of what the upgrades would cost, at least in the US. Depending on what you do with the machine, 128 GB SSD may be fine.
Unfortunately I'm base in the US and don't know places with good deals in the UK.
Here is an EliteBook 8440. It has the 8GB of RAM and a 1TB drive, but the drive is mechanical. This is six year old, if not more, technology.