For crying out loud.
The "blotch" is caused by damage to the drum or to the toner fusing roller.
If the "blotch" is loose toner (in other words you can smear it) then the fuser roller is damaged and that assembly needs to be replaced.
If the "blotch" is fused (in other words you cannot smear it around) then the drum is damaged and that assembly needs to be replaced.
The original MSRP for the Brother MFC-7440n in 2008 was $429 (US) / 213 pounds [FixYa couldn't handle the pound sign!! =8-) ] (UK) / $499 (AU). The present street value is about $199 according to Brother ( http://www.brother-usa.com/MFC/ModelCompare/4/MFC7440N_MFC7460DN#.UXBKKKLq3yA
A drum unit is $80 (Amazon) or $115 (Staples).
That same $200 could get you a Canon Pixma MX-922 (Canon http://www.usa.canon.com/cusa/consumer/products/printers_multifunction/office_all_in_one_inkjet_printers/pixma_mx922
). Inkjet? Yes. But fast. Airprint. 2-sided ADF and copying. Auto-duplexing. CD/DVD disc printing. Frankly, if I didn't already have an Epson 835, I would buy this one. My old Canon 820 still chugs along as beautifully as the day I got it (about a zillion years ago).
For $50 more you can get a top-rated laser, their imageCLASS MF4880dw (though oddly, without Airprint - for Airprint in a Canon laser, you have to step up to the big boy: the imageCLASS MF8580Cdw).
Well. Have fun!