Sinead, over the years I've actually found most the staff in the two Jessops I often use very helpful & polite.
I actually bought a high-end DSLR in my local (UK) store two months ago, and the staff were knowledgeable, when it comes to films some aren't. At no point did they try & sell any extras, I think they knew better than try
You worked there, in a store, so you know that the problem isn't the staff it's the system & the management from Leicester, I've been there & dealt with them as a supplier, they've lost direction, at a very senior level..
My local store is quite well run, one member of staff worked for the original independent store (20+ years ago) that was taken over by a small chain, (and still good), and later bought by Jessops, he's definitely jaded by the Jessops experience and while still good has lost his spark though

Others are extremely helpful, I needed a battery , which they didn't stock and it was an instant try here, showing me an AP advert for a good supplier.
Those outside the UK won't realise that Jessops think they dominate the market in the UK, they had a store in just about every major town and a few in each city, they bought up most competing chains. Then suddenly they dropped film cameras entirely and went 100% Digital way ahead of anyone else in any country. But that lost them customers, as the film users took their business elsewhere, and if they started using digital bought from the new supplier.
In towns with other stores the competition are usually far better than Jessops, because they are run by people with a passion or at least an understanding of what photographers want.
I know Jessops from 3 angles, supplier, customer and at a personal level meeting up with the former Chairman outside of Photography, and it's in dire straits unless it re-invents itself.
Ian