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Totally unqualified, but unless you have done it without freeholder permission and as long as there are no fire safety issues, I would put it on the market and wait to see if anyone asks. Then offer indemnity as a compromise.
Sounds like you did things safely. BC signed off a wall removal we did at a glance without even checking the new brickwork and steel reinforcement we added in the basement.
cjr-
We have a buyer already, and they are asking, or rather our solicitor has it in their questionnaire: something to the effect of supply all the relevant docs or a good excuse why you haven't got them. I think not mentioning it at this stage would raise eyebrows and probably quite illegal.
If I can get it done quickly enough then a 'regularised' sign off should be able to cover the building work and the window hopefully.
Polygon
Coming to sell and I realise I've been a bit hapless on complying with the relevant regulations in relation to our small bedroom renovation done a few years ago. I got the remains of a chimney stack removed - this didn't previously exist below or above 1st floor level, just the bit in that room, resting on the steel below. Big structural stud put in as per engineer's drawing, but for some reason I didn't get building control involved, seem to remember coming to the conclusion that it wasn't required at the time, but now I'm doubting that. Emailed my LA BC department to check.
Also got the builder to install a replacement window but now realise that I should have probably paid for someone FENSA registered to do it and got the certificate. At least if I have to get BC out to sign off the wall hopefully they can do the window at the same time?
Thinking an indemnity policy is probably the cheapest and most expedient option here though.