have you not seen UK 2016-2024? The current grown up governemnt with a huge majority is the consequence of on so many levels of failure including Brexit of last 8 years. £1 on
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/16 was 52.50 baht. By 1st of July 2016 fell to 45.0 baht with a later further corection to 35 baht. Pound therefore still did not recover compared to Baht exchange pre-brexit. Hardly a recovery. Same trend against € and US$ over last 8 years since Brexit.
If you become a tax resident you can be taxed on your remittances. The Thai Tax system is similar to most being progressive tax systen starting with a 0% tax bracket and ending with highest of 35% for remittances over 5 million baht pa. A Bigger worry should be if (when) the worldwide earnings become taxable and not just remittances to Thailand. In some countries like Italy the civil service pensions are tax exempt (not state pension) and you may wish to seek advice whether there are any exemptions in Thailand.
It will be stamped in line with the expiry date of your health insurance as long as previous extension still in date and a new insurance obtained and presented to the immigration officer.
Midweek days cheaper than weekends when booking a week yet go according to the lowest advertise price most likely being Tuesday and wednesday. I usually find agoda best value for money and certainly easiest to navigate app.
Do register with a GP immediately. Everybody has a right for primary care on presentation (in person, not on presentation of documents). Hospitals may however require further documents proving entitlement to care but by then you will be likely a resident in uk for 3 months and entitled to care (GP referrals are usually not scrutinised though). We complain about the NHS however when things go wrong privately, treatments abroad, not insurance covered or uninsurable it always fall on the NHS to pick up the pieces.