Just a reminder to folk not to share email addresses in public (otherwise you will be likely to suffer an increase in spam). If you are a registered user of this website and logged in, you will notice that there is a now messaging facility (it’s relatively new) so you can send a message to Gerry (or anyone else) directly 🙂
Back to the question in hand; Gerry, the very approximate value of your property can be seen here: http://www.mouseprice.com/house-prices/brunswick+centre,+wc1n?SortBy=2
Whether the charges are reasonable or not I have no idea. For 2 bedrooms in Kiln Place (60.7m), according to a recent service charge statement, the cost is £196.95 plus a 10% management surcharge per year (if that helps). Flat prices in Kiln Place can also be looked up on the above website.