Cisco PIX Site to Site VPN - help

We currently have 2 site to site VPNs one from Brghton to London and one from Newcastle to London.
Im trying to set up another  - Newcastle to Brighton.

Here is the original config of the VPN currently set up on Newcastle to London. (the brighton one is almost identical, but has changes to ip etc..)

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access-list inside_outbound_nat0_acl permit ip any London-SN1 255.255.255.0
access-list inside_outbound_nat0_acl permit ip any London-SN2 255.255.255.0
access-list inside_outbound_nat0_acl permit ip any 172.16.174.96 255.255.255.240

access-list outside_cryptomap_20 permit ip Newcastle-SN1 255.255.255.0 London-SN1 255.255.255.0
access-list outside_cryptomap_20 permit icmp Newcastle-SN1 255.255.255.0 London-SN1 255.255.255.0
access-list outside_cryptomap_20 permit ip Newcastle-SN1 255.255.255.0 London-SN2 255.255.255.0
access-list outside_cryptomap_20 permit icmp Newcastle-SN1 255.255.255.0 London-SN2 255.255.255.0

nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group inside_access_in in interface inside

crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto dynamic-map outside_dyn_map 20 match address outside_cryptomap_dyn_20
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5
crypto map outside_map 20 ipsec-isakmp
crypto map outside_map 20 match address outside_cryptomap_20
crypto map outside_map 20 set peer London-GW
crypto map outside_map 20 set transform-set ESP-3DES-MD5

isakmp enable outside
isakmp key ******** address London-GW netmask 255.255.255.255 no-xauth no-config-mode
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400

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These are the additional settings ive added on newcastle.

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access-list inside_outbound_nat0_acl permit ip any Brighton-SN1 255.255.255.0

access-list outside_cryptomap_21 permit ip Newcastle-SN1 255.255.255.0 Brighton-SN1 255.255.255.0
access-list outside_cryptomap_21 permit icmp Newcastle-SN1 255.255.255.0 Brighton-SN1 255.255.255.0

crypto map outside_map 21 ipsec-isakmp
crypto map outside_map 21 match address outside_cryptomap_21
crypto map outside_map 21 set peer Brighton-GW
crypto map outside_map 21 set transform-set ESP-3DES-MD5

isakmp key ******** address Brighton-GW netmask 255.255.255.255 no-xauth no-config-mode
isakmp policy 21 authentication pre-share
isakmp policy 21 encryption 3des
isakmp policy 21 hash md5
isakmp policy 21 group 2
isakmp policy 21 lifetime 86400

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Ive set up a smiliar one for the brighton config. replacing values etc.. to match the connection.

Anyone see anything wrong with that or if ive missed anything out?