Hi I would do a CELTA a 120 hour course with 6 assessed lessons. It's tough and more so for QTSers as the delivery method is very student centred unlike most pgce training. I did mine before my PGCE and thought it was worth it. If you fancy travel and adventure the combination of qts and a celta means you can work in various roles and prob pick up jobs in private schools or lower tier int schools easily. Travel and have fun!