Any experts on this?

I'm not an expert on Spectrums myself... A bit before my time haha. My brother in law runs a charity and they sometimes get stuff in to sell at events to help raise funds for the charity and my father in law (the family help out) sent the above photo asking me if I had any idea how much is might be worth and if I want it. I said I'll try to look into it for them.
They say it's been fully tested and checked and seems to work.
Question 1: Should I take it? They'll probably give me a discount
Question 2: How much do you think it's worth? There's two on Ebay, also boxed, one is £100 but the box is really battered and in rubbish condition. The other is £180 and again doesn't look like marvelous condition, but does come with a whole bunch of games.
I'm UK/European for context.