For the price, I'm very pleased with the tweed suit I got from Abitto. It arrived quickly and, unlike a lot of other on-line tweed suit sellers, they're shipped from within the UK so there's no chance of getting hit with import duties.
I couldn't get through to the company by phone, but they always responded within 24 hours by email and were perfectly pleasant to deal with.
Only downside is their sizes are a bit all over the place. None of the clothes have an integral label showing their size, they've got a separate label tied to them. That's fine and actually probably enhances the look of the suit ... as long as the correct label gets attached to the item of clothing.
I had to go through 3 pairs of trousers before I got ones that were actually the right size (despite them all having the same waist size label attached). They replaced them quickly with no questions asked, it was just a bit of a hassle.
So in short, I got a suit I'm very happy with, and the company were fine to deal with. But it's worth giving yourself plenty of time if you're buying a suit for a special occasion in case you need to go through the rigmarole of sending things back to get the right size.