I bought one in February from http://www.seiyajapan.com/. Excellent service! It got sent out pretty much straight away (UK customs took about 7 days to process and send it out to me once it had landed in the UK). You will absolutely certainly incur customs and handling charges though since Seiya is completely honest when marking up the package (some suppliers put fake values on to reduce or avoid customs charges). Also, Seiya's wtahces all come with the original and complete packaging, unlike some other suppliers.
My Sarb035 came to me at just over 301GBP after customs and handling charges were added.
EDIT: By the way it is a Japanese Domestic Market model and is not sold in the UK, so your only option for a new one is to import. Great choice of watch IMO. It's certainly dressy but I've actually strated to wear mine with jeans and a t-shirt so I'd say it's pretty versatile.