For reference, here is a list of providers offering anal in Norwich, the best bet are the MILFs. There are a couple I haven't tried but verified the price over the phone.
External Link/Members Only or
External Link/Members Only, £100/hour
Cheap option, she had difficulty with anal and had to stop after a few thrusts
External Link/Members Only or
External Link/Members Only, £120/hour
Enthusiastic, incall hours limited as she works from home
External Link/Members Only or
External Link/Members Only, £120/hour
Not tried, rather chunky for my liking
External Link/Members Only or
External Link/Members Only, £130/hour
An unusual one, she's a post-op intersex. Also up for DP with a partner
External Link/Members Only or
External Link/Members Only, £140/hour
Raunchy skinny MILF, a personal favourite
External Link/Members Only or
External Link/Members Only, £140/hour
Slim and obliging, outcall only
External Link/Members Only or
External Link/Members Only, £140/hour
Profile not up at the moment, may be on holiday
External Link/Members Only or
External Link/Members Only, £140/hour
Not tried, put off by the difficulty in booking. Seems a is on offer only after she gets to know you
External Link/Members Only or
External Link/Members Only, £150/hour
Not tried, put off as she wanted a photo before meeting
ttps://www.adultwork.com/1006269 or
External Link/Members Only, £150/hour
Not tried, claims to offer bareback
External Link/Members Only or
External Link/Members Only, £160/hour
Outcall only
External Link/Members Only or
External Link/Members Only, £160/hour
Offering a discount for BDSM tutoring
External Link/Members Only or
External Link/Members Only, £160/hour
Not tried, unclear if she does it or not in the first meet
External Link/Members Only or
External Link/Members Only, £180/hour
Not tried, steep price for a BBW
Then there's the usual travelling circus of Romanians. Many that list anal on their profile don't offer it, best to check beforehand. Some may ask for an extra, like this one currently in the city
External Link/Members Only or
External Link/Members Only, £160/hour
Her anal supplement of £40 was steep so I haven't seen her
Finally there are WGs on tour, check reviews on aw and here before deciding to take a punt