For my money "sussex-stamps is "as crooked as a coathanger", and I will no longer have anything to do with him. For the small minority of items which may be genuine it is just not worth the trouble. I bought 2 lots, both of which were fakes - a month later I am still dealing with returning them for a refund.
The dealer is extremely unresponsive, and being that he is overseas does not make things any easier...