double sink, is my plumbing wrong?

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When my mum moved into her 6th floor apartment (multi-storey block) the kitchen sink plumbing was old and leaking. I bought a kit and duly fitted, all was okay for the first few weeks. Then it blocked. Took everything off right up to the back of the unit,after which I have no access. Nothing to clear, reassembled, problem solved ... somehow!

Ever since, it remains unblocked for x weeks/months then blocks again. I never see anything in the plumbing under the sink that would cause the block, so I'm assuming it's intermittently blocking 'behind the scenes' where I have no access due to this being a mutli-storey. Actually during the most recent blockage it was draining okay for a few secs and then you heard it backing up. I did put a flexi drain rod thing into the section of pipe that runs behind the unit (can't be seen in the pic) but it went all the way in without a problem, hence me thinking it's a blockage I can't get to.

In terms of the plumbing I've done, is there anything wrong with it or a way it can be improved to perhaps prevent future issues e.g. I'm wondering if the way I've plumbed it might sometimes cause an air blockage or something if the conditions are just right? Would it be better for the two vertical sections of pipe immediately under the sinks to be shorter? I had to install it this way due to limitations of the kit however would adapt it with new piping if this would help? This would also make the horizontal section between the sinks higher up i.e. closer to the sinks.

Note the washing machine drain feeds into the pipework. When a wash is draining the water backs into the sinks about 2-3 cm's then clears when the machine stops pumping.

 
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Should the sink over flow be on the bigger bowl? Never seen an overflow on the smaller on.. Unless it's shared from the top..
 
Thanks for replies, I'll leave it as is and see how we go. I can't remember without looking at the sink but I think the smaller section of pipe you see leading up side of small sink actually serves the drainer i.e. it's not really an overflow as such.
 
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Give it a few months and it will stink......excessive amount of internal pipework before water seal is always gonna be a no no..
Anyone can call themselves a plumber these days......a proper plumber is like gold dust.....industry gone to the fookin dogs...it pains me seeing this abortion...
Rip it out and call a professional.
 

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