Leaflet Map using Proj4Leaflet to display a projected TMS base map from MapProxy

osgb_map.js

// Bounding box of our TMS that define our area of interest
var bbox = [-600000, -300000, 1300000, 1600000];

// Resolutions of our TMS that the tiles will be displayed at calculated so
// that at resolution 0 the bounds fit one 256x256 tile: (maxx - minx)/256
var res = [7421.875, 3710.9375, 1855.46875, 927.734375];

// Define the Proj4Leaflet coordinate reference system base on British National Grid
var crs = L.CRS.proj4js(
    'EPSG:27700',
    '+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs',
    new L.Transformation(1, -bbox[0], -1, bbox[3])
);

// Define a scale custom function to calculate
// the scale based on the current zoom. Prior to
// v0.4 the scale function was a member of the map
crs.scale = function(zoom) {
    return 1 / res[zoom];
};

var map = new L.Map('map', {
    crs: crs,
    continuousWorld: true,
    worldCopyJump: false
});

var mapUrl = 'http://my.mapproxy.server/tms/1.0.0/layername_EPSG27700/{z}/{x}/{y}.png';

var tilelayer = new L.TileLayer(mapUrl, {
    tms: true,
    maxZoom: res.length - 1,
    minZoom: 0,
    continuousWorld: true,
    attribution: 'Copyright 2012'
});
map.addLayer(tilelayer);

// Centre on London zoom to the maximum extent
map.setView(new L.LatLng(51.33129296535873, -0.6680291327536106), 0);

From memory, the projection might not be quite right (offset by ca 200m). Try removing the DATUM declaration, and replace with a correct towgs84:

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m +no_defs

how to overlay maps on openlayers API by tms server I render maps by mapnik but doesn't dysplay on openlayers API
please help any one !!!