2.3.5 gingerbread stock uk rom needed

If Samfirmware, AndroidFirmwares.net or Samsung-Updates.com don't have what you want, you're SOOL.

You won't find it anywhere else, the chances of someone reading this who coincidentally has a copy handy these days is zero given how few people read/post here - there's a fair chance you'll be sitting there in a month & probably won't even get another reply to this thread (and the reason for that is as above; those 3 places are the only places you're going to source a 3 yr old firmware for a 3yr old phone).

Besides, why do you think need that particular firmware ? I'm not seeing why you can't use any other firmware for your country/carrier. If I were in your situation, I'd be investigating that one, otherwise you probably won't be fixing it.

I'd be checking the date of whatever you're reading. Are you sure it's not dated around the time this phone was released ? If it is, that would explain why that firmware is recommended (may well have been the only firmware available at the time).

Essentially, firmware is firmware, the differences between them are minimal - only differences are the modems, and carrier-specific 'crapware'. The kernels are sometimes a little different depending on date of release (maybe different Linux kernel version), but the main differences happen when you're talking about roms with different Android versions (GB-ICS-JB). Even then, I'm not seeing why you need a specific firmware for an EFS repair/IMEI re-write.

Up to you what you do, but as I said, expect to still be looking for this firmware weeks from now if you insist you need that & only that one.