Have received a call back from Thai Consulate in Liverpool (http://www.royalthaiconsul.com/), they've confirmed for Single Entry:

 

Only require passport & 2 photos

Fee: £25

Appointment required for same day turn around (£10 extra)

Should be in & out within an hour.

 

Proof of funds & employment/Self assessment not required (making this option much simpler & cheaper than multiple entry)

 

No postal applications to Consulates (have to be sent to London)

 

Click here to download your Application Form

Edited September 20, 20169 yr by slippedisc
form download link

Some consulates (e.g. Cardiff) will do a visa while you wait (by appointment) with no extra express charge.

Edited September 20, 20169 yr by BritTim

1 hour ago, BritTim said:

Some consulates (e.g. Cardiff) will do a visa while you wait (by appointment) with no extra express charge.

Are they still doing that? I thought it had all been stopped now and everyone has to go London Embassy to get visa next day?

1 hour ago, jay171275thai said:

Are they still doing that? I thought it had all been stopped now and everyone has to go London Embassy to get visa next day?

 

They are not authorized to issue every kind of visa, and some that they are permitted to issue require that you send supporting documents in advance (when intending to get a visa while you wait) so they can get it approved before your visit. However, I think most (all?) UK consulates can issue a visa while you wait by prior appointment. Some charge an express fee, some do not.

Edited September 20, 20169 yr by BritTim