You need to be very realistic about cost of living in the UK. What are your expectations about living and material goods? Brighton is extremely expensive and you might not be able to afford a house or an apartment on a Lecturer's salary unless you have property that you're selling in the US and will have some money to use as a down payment.
To research house prices you can go to:
http://www.rightmove.co.ukAs for closing the Chemistry department I thought that they were doing it because of the RAE and the number of students enrolled in the field.