I want to buy a new bag in the sales - all the ones on just Geiger sale are synthetic- is that ok?

[Beaverfever]

I had always thought I should be looking for leather but in far from flush right now.
Happy to spend up to £80

No, that's enough to get a leather bag somewhere else.

Is there any shops I should be looking at specifically?

In my mind I want dark grey leather, largish maybe more slouchy or unstructured at least with grab handled and shoulder strap with possibly some additional detailing such as fringing or studs

Quite specific!

Look in TK MAXX, they're excellent for bags, and they display them by colour which is v handy.
I got a great quality slouchy leather bag from M&S last year for 85 quid, but not sure whether they'd have gray.

Try John Lewis. Synthetic leather doesn't age very well. I just wouldn't bother.

www.johnlewis.com/collection-weekend-by-john-lewis-sarita-star-print-large-backpack/p1957538?colour=Grey

This for example...

No grab handle, could maybe watch incase it goes into clearance?

www.tkmaxx.com/view-all-womens-new-in/dark-grey-leather-unlined-hobo-bag/invt/11029811

Having had a bit of a google I think there are loads of bags in the shape you want but grey may be your sticking point. M&S and Clarkd have some nice ones in your budget but not in grey - have a browse and see if you can find another colour you fancy. Debenhams had a nice one in purple bizarrely.

Bingo ???

Rather nice in random purple. The ill-conceived "BJ" logo is removable thank heavens .