I know of no non egress/easy clean window hinges that comply with building regs. They will be looking for the window to open to at least 85degrees , as flush to the side if the frame as possible ( like old wooden windows). The clear opening has to be a minimum of 450mm wide X 750mm high ( 0.3m2) , unless that is physically impossible. Top hung hinges automatically become fire egress hinges but you should still be looking for that clear opening size ( by clear , I mean at no point when the window is open fully us the narrowest point less then those dimensions).
As goes the regs... replacement windows state that ALL habitable rooms upstairs must have fire egress ( Inc offices ) , which means you may have to alter the existing styles to facilitate fire egress. The general rule of thumb is if you can get a single bed in it is habitable. Bathrooms are exempt but not upstairs living areas or upstairs kitchens ( best practice ) . bungalows and ground floor, if you can exit the room via a door that goes to a corridor or a room that has a door leading directly outside then you do not need fire escape hinges. If however the door from the room exits to a room or corridor with another door leading to an internal area of the property it needs a fire egress hinges ( these are typically known as rooms within a room ...usually ' snug' type rooms or offices). Good practice is ALL downstairs bedrooms get fire egress ( not required by building regs though ).
Anything too small for fire egress , take a picture and do the best you can , keeping a record of the 'clear' opening, sometimes it is impossible to satisfy fire egress perfectly. As long as you can prove you didn't make the ' clear' opening any worse you will be fine.
There is one exception to the above , and it is mightly odd in my opinion...and that is if you are replacing old uPVC then you can replace like for like as long as you are not making the situation worse...my opinion ignore this and always try and get fire egress hinges in!
OP , for the cost of fire egress hinges , is it really worth it, at point of manufacture , maximum cost should be £10-£15 and even retro fitting , the hinges are still only £25-£30...
Personally , as a company , we always err on the side of caution, if in doubt put fire egress in ... All bedrooms regardless of location get fire egress. I'd rather know we've done as much as possible to aid in someone's escape in the event of a fire