I used Varstrom twice now- Best price !!
I used Varstrom twice now, 3 years ago and a week ago The best way is to chat with them via their web chat. keeping in mind they are on HK time not UK time. I ordered the BSS02b 750w with a 20Ah battery and it arrived 3 days after order ( 27th in the morning , 30th in the afternoon ) on my first order they replace a burned out battery connector and were always very help full