If you can get business seats I would definitely take them and book asap. On the 737-800 there are only 3 rows of 4 seats. We left it too late last year and were down the back. Width seemed exceedingly tight and felt more like LCC than BA A320. We flew from MEL to WEL. At MEL, after hold luggage was weighed and sent on its way, all hand luggage that remained on the trolley or with us had to be removed and weighed including handbag and coats.