well i am in nw6 near hampstead and am not married! but am older than you...
there are lots of things on for under fives in london - and espec in nw3/nw6/nw5 areas.
go down to swiss cottage community centre and library check it out. library does rhyme timne and lots of activities in teh week (and weekends)
also community hall in hampstead on teh high street has drop in groups - also other places. check out childrens centre in kentish town (sure start) and stuff on at talacre.
check out local sure start groups etc, church hall groups and so on.
see if kentish town sewimming do a creche.
do something new - join the badminton or other sports groups locally eg talacre to meet other adults. or take up tai chi or kick boxing or climbing at swiss cottage sports hall.
if you want a man above all try internet dating. but a man wont solve your self esteem /confidence issues....you need ot be confident in yourself do somehting for you....
but to boost your self esteem and just meet local people try the things above...
also you need to build confidence in leaving your daughter with someone you can trust. ask HV to put you in touch with local mums too.
to swap baby sitting.
make it your mission this term to join new groups with your daughter. swiss cottage comunity cafe is cheap and they have lots going on in the hall - look on their notice board.
more down to earth than the cafe in the sports centre - but the library at swiss cottage is always busy with mix of people -nannies, single mums/dads etc.
teh gingerbread office is in kentish town - so talk to them...
Gingerbread office
Gingerbread
255 Kentish Town Road
London NW5 2LX
Contact Gingerbread via email
General telephone: +44 (0) 207 428 5400 (Monday to Friday 9am-5pm, with extended opening on Wednesday to 8pm)
Single Parent Helpline: 0808 802 0925 (Monday to Friday 9am-5pm, Wednesday 9am-8pm) free from landlines and the following mobile networks - 3, T-Mobile, Vodafone, O2, Orange, Virgin.