Don't feel sorry for us. We'll cope as we always have. It's the lower middle class panicking about budgeting, not us.
I'm surprised at your faux pity-party for the poorer of society, whilst simultaneously boasting of your wealth. It's quite bad taste - it seems money cannot buy someone out of crass behaviour.
I'm assuming this attitude has come about because a working class person has told you that the business model you have is not fit for purpose anymore, if you're panicking and having serious 'all night' talks with your DP about having to sell your business. Imagine that - the working class telling lower mid class they're underselling themselves - must be quite the insult, if you have mid-class views, I suppose. It's not quite the personal attack you have taken it as. In fact, I believe I did tell you it was quite noble (certainly it would benefit lower earners like myself currently) - but, as you originally posted, it's just not sustainable anymore. I'm in full agreement with you.
I'm glad you are able to sell your business - it will save you a lot of heartache in the future, and if you aren't willing to raise your prices, then this DOES make good business sense, to sell out. As you say, your OH will still find work, most likely for a practice that is successful and still profitable because it charges more than £15 for a consult. I'm also glad you were able to tell us all about it, I imagine it's helped make you feel better, because it definitely seems that's the default self regulatory tactic when the old self esteem has been dented slightly. What a shame.
It would be lovely if cheap veterinary care in order to help animals and clients was sustainable long term throughout a changing economy. You've found it sadly, is not the way it works.