This is significantly different from my calculations, can I ask how you came to this amount please?
Any B&M (bricks and mortar - i.e. physical) business is in the real-estate business. The question is, what side of the desk do you want to be?
Spanish kiddies' clothing is just the reason that you are in the real-estate business. I could be anything from sex toys to books, from pets, to pies, from beer to beef, what you sell is the least most important part of what you are doing!
As a B&M shop, you have two main costs - staff and premises. The rest is a calculation. Buy for £X, sell for £Y. But staff and the building just refuse to go away. Even if the staff is just you and yourself - you are still there!
I'll put this simply - I knew a guy who started a recording studio that went bust. It was in North London. After 35 years of giving it his best shot, he was forced to give up. He bought the building for £50k and put equipment in it for another £100k and had 35 years of a fantastic life, but in the end, it all fell to bits. The big shots all had their own studios and the bit-players were all using PCs and Macs at home. He may have rubbed shoulders with the good, goofy and great, but he walked away from the table with nothing.
After all those years, all he had to fall back on was a state pension. And then he sold the building for £4.6m. That was when he realised that all those years, he had just been enjoying the good life, covering his day-to-day costs, whilst he had been in the real estate business!
Staff and building are the skin you have in the game. Selling stock is the game you play to to cover that 'skin'. The problem is, today, the B&M gig is more or less over for many types of goods.
That's the cool thing about business - you are always on shifting sands. Nothing ever remains the same! Just when you think you have got a safe number, someone comes along and changes the rules.
B&M gives way to on-line, on-line gives way to mobile, mobile gives way to VR - and so on!
Just when you think you've got it cracked, it cracks!
£100k and £15k pcm TO is what it will take for you to crack the online market in such a way that you will be able to pay for the dreadful sinkhole that is a rented shop and the cost of putting at least one person in there.
You could, of course start in on-line shop geared to the 'yummy-mummy' mobile phone market and avoid all that heartache and pain!