New passport since income confirmation letter from uk embassy

[Chongalulu]

My annual marriage visa extension is due on 23 January and I got my income verification letter from uk embassy dated 11 November. I did it then because it is valid for 6 months and because my income is based on rental of my uk home, but from the end of October the tenants moved out and don't expect to find new ones until sometime next year. However I subsequently found out that as my passport expired in August 2016 any visa extension would only apply up to its expiry date giving me only 7 months. So last week I submitted an application at Trendy for a new passport. I've just noticed that the letter quotes what will become my old passport number when new one arrives. Is this likely to cause any problems at immigration ? If so can I get the embassy to reissue the letter with my new passport number? Will it have to be an entirely new application requiring up to date bank statements ( they asked for last three months previously) because that will be a problem as no rental will have been paid in since end September (rent is paid one month in advance) . However as the net rental income was £3000 (150,000 baht month) per month since October 2014 it only takes just over 3 months rent to reach the required annual income. Periods of unoccupancy are normal,it's just that it falls in this instance at an inconvenient time if a snapshot of 3 months is used to determine annual income. Grateful for advice from the knowledgeable members like Ubonjoe.

[lopburi3]

I suspect it may be an issue if they are looking for one - but would give it a try - nothing lost in doing that - just allow enough time to make a visa run for a new non immigrant O visa to Savannakhet in the event there is an issue. Then when income provable again you can get letter and start extensions again.

As for Embassy re-issue of current letter you could ask. But suspect chance using current letter at immigration may be higher than getting Embassy actions without new proof.