What has made you want a unit mate?? Don't you know anyone to rent there garage or similar??
Seems a lot of money to throw away a month unless you have plans to get really big.
Rates and water will cost you a bomb on top of your £240 a month.
I rent my neighbours garage for a free clean once a month(bargain) she lets me fill tank up with her water too, I also do the same with my garage which is dead handy as are both next to each other, I sell water to 1 cleaner for as much as he wants for £80 a month and another who only uses 200-400 litres a week buys the resin when it needs changing every 3/4 months. I know I have it easy but even still it would break my heart shedding out mega dough to rent a small lockup unit to work from.
I can understand the thought of keeping work and home separate but it does come at a price that I'm not willing to pay yet unless I really have too.
I know what your saying mate but i live in a victorian terrace so getting the water to the van is a nightmare.
My house is 70ft long from the back door.
So i have to carry 20 water barrels through the house everyday.
If i get a unit i can fill as and when i need without the carrying.
I can also park van or vans in there in the future.
I plan to get to 2 vans next year.
It is a lot of money but if im going to do it big its a small price.
The water is not on a metre and is included in my rent so only bill on top is electric.