Check that the pieces are present including bobbin case and at least one bobbin.
Make sure that there's no rust around the bobbin case.
Insert a needle and turning the fly wheel by hand see if it makes a stitch. You will feel whether the action is smooth or stiff. It may need a little lubrication.
If the action is smooth the next step is a quick visual check for any bare or disconnected wires.
If the action is stiff, it's better to deal with that before running it with the power.
Plug the machine into a surge protector extension lead and make sure the power is switched off at the power point.
turn the switch on the machine then step away from the machine and turn on the power at the plug. No bangs or whiffs of burning smells is good.
If the machine suddenly starts running on it's own, the issue will probably be a failed capacitor. It's fixable and not a deal breaker.
The machine sits there quietly, say hello ('tis always a good idea to be polite just in case
), and then using the pedal do some test stitching. Move the stitch length lever up and down.
check that the bobbin winding mechanism can move onto and away from the fly wheel. Don't worry if the bobbin winder rubber has perished or is as hard as a rock - it can be replaced.
Also check that the inner metal disk on the fly wheel will move so you can wind a bobbin without the needle going up and down.
At only £85, if the machine looks okay, even if it's not working perfectly, spending on a service and some repairs and even new wiring is worth it.
By way of example, my 221K (in good condition with a lot of accessories, new wiring and serviced) was a real bargain at £120 around 5 or 6 years ago. Prices/values have gone up a little bit since then.
Hope the above might suggest a way forward for you.