For your information the wedding rates for the Square Tower are as follows:
2 hour wedding ceremony slot: 
Monday to Thursday £400
Friday, Sundays, Bank Holidays £750
Saturdays £850 

All-day wedding bookings: 
(as much time as you want on your chosen day until 11.00pm + up to 2 hours the evening before) 
Monday to Thursday £1,300
Friday and Sunday and bank holidays £1,600
Saturdays £2500