If it gives you pleasure
…keep it.
Think these sold for around £700 new, but these days it is only going to be worth a fraction of that., had a quick rootle around and the only price for a Sterling I could find was an archived sale of a bike that went for 98p (which is an awesome bargain). After a quick look on ebay I reckon you’d get around £30-£40 on there. Don’t think that will go very far in fettling an MTB.
So I’d keep it, it looks a really nice bike.
No offence taken btw 🙂