I visit Colchester now and again with my job, there are lots of newish profiles up in the CO1 area, all around the £100 mark as I'm sure you have seen through your AW search.
At little bit further out, but good access from the A12 if you are driving is FallenAngel100, lovely ,sexy part time Milf but incredibly dirty if requested!!
I've visited a few times and can highly recommend, a fair bit more than your budget request but well worth an hour IMHO, it's what we have to stump up out here in East Anglia for a quality punt!!
I did a review of FA on the East Reviews board a few months ago. PM me for any further details if you need them, she works from her own home by the way. Very very popular girl though, easy to see why when you have an hour with her. Face pics in PG as well. https://www.adultwork.com/1648494