Leather handbag replacement - bespoke? Recommendations please!

[CorporeSarnie]

Hi all,
My much-loved Debenhams mini-satchel is reaching the end of its life after 5 or so years of service. Pic should be attached. I would like something similar-ish, if possibly a tiny bit larger, in good quality leather, tan ideally.
I would like pockets for phone, keys, compact mirror and lipstick etc.; this one has magnetic clasps under the buckles, which make it easier to open/close than real buckles would, and a lined main compartment.
Must have a shoulder strap as I have two under 4 and need hands free.
I don't want to spend more than £200, I know for some that is peanuts but to me it is quite a lot for a bag (and ideally I'd spend more like £150); I want something that will last 5-10 years or so.
I have had a small google of British bespoke handbag designers and if anyone has recommendations I'd be grateful for advice. Happy to go high street for something that fits the above, but equally happy to go down the bespoke(-ish) route if it gets me what I want.
TIA