Had a similar annoying experience with Countrywide.
Planned an extension, got three local agents to value our current layout and with the work complete before going ahead. All fairly favourable and similar sales prices on our street, so got in touch with the lender (Barclays) to arrange a mortgage extension.
Countrywide arrive to do the survey. 5 minutes in the house (at least he came into the house!), didn’t see every room, came back 12% under (on a ~450k house). Didn’t want to mess with the LTV so limited what we could borrow. Barclays would’ve accepted a full survey (at our cost obvs), and would have delayed things by a month or more. We’re building a smaller extension (which tbf isn’t such a bad thing).