Anyone tried this ? https://www.eastathome.com/product/buy-bir-base-gravy-online/

No.  I saw it, I was tempted, but I am still undecided.  If you (or anyone else) tries it / has tried it, do please report back.
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** Phil.

From the page:

Onions, Water, Vegetable Oil, Plum Tomato, Garlic, Ginger, Salt, Tomato Paste, Coriander, Turmeric, Cumin, Chilli Powder, Paprika, Garam Masala, Fennel, Cinnamon, Nutmeg, Cardamom, Mace

Store in a cool, dry place away from sunlight. Once opened refrigerate and use within 3 days. Do not use if pouch is bloated or leaking. Unused gravy can be frozen for up to one month.

No numbered food additives and storage instructions would indicate "clean" preserved packaged food.  I would consider it a pretty good bet as it appears reasonably priced.

OK, gave it a go —

BIR Base Gravy - 10 x 400g Pouch £24.99
BIR Base Gravy - 1 x 400g Pouch £2.99
BIR Mix Powder - Resealable pouch 80g £2.99

Total £30.97, so qualifies for free delivery.

I'm looking forward to your review of this Phil.  It isn't something I'm going to come across, but at the price per pack for 2 curries you can hardly go wrong.  20 odd curries should keep you going for a little bit.  The interesting spicing in the gravy (and mixed powder) is the nutmeg and mace.  I like both so it could be something to play around with in the future.

Quote from: livo on October 31, 2022, 09:52 PM
The interesting spicing in the gravy (and mixed powder) is the nutmeg and mace. 

Both (as I'm sure you know) from the same seed, the mace being the "skin" around the nutmeg ...