had our visas done begining of the month sent new passports,no probs,just filled in everything they asked for,although i meant to tick return by royal mail and did dx by mistake so payed online for that couldn't find the add on for my husband so did a seprate application and ticked royal mail for his(it had nearly taken 3hrs by now and i was losing the will to live

)They both came back in the dx envelope and no sign of the special delivery one with all the stamps on,but i posted them 31st dec had them back 4th jan which is quite a result.Good Luck