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guess tonnes of bicarb and boiling water is OK to put down the drain
One shot is the first port of call for most trades. It is hard for non trades people to get hold of these days as cunts decided it was fun to throw in other folks faces, however if you try your luck at a plumbers merchants you may be able to get some (most will sell it to non tradespeople who look responsible).
I have a similar setup to you and when it blocks I use that stuff to clear it ~ 2 bottles normally does the trick
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you could try rodding with a normal hose pipe if the pressure is good (not the best but its something) - that drain should have a rodding point - remove the cover and rod it
or see for any manhole covers nearby to clear the blockage
you might struggle with bicarb as the fats will have solidified in big chunks
Cheers.
Probably should have said that there is a cover which I removed for the pics.
Fat/similar sounds likely.
It's just a bit tricky as there s a fuck-off big iron pipe running into it.
I guess tonnes of bicarb and boiling water is OK to put down the drain without worrying about the environment?